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And then some ellipses that AUGR estimator is better than the OLS estimator and AUGL estimator is better than the OLS estimator are given, respectively.Second, the definition of the almost unbiased unified biased estimator is proposed. This definition includes the familiar almost unbiased estimators in literatures, and it is the unified expression of the familiar almost unbiased estimators. Followed the biased and variance are compared of AUUB estimator and the unified biased estimator, respectively. AUUB estimator has smaller bias than UB estimator and the variance of AUUB estimator is between the variance of UB estimator and 4 times of the variance of UB estimator. Finally the properties of AUUB estimator are discussed. The conclusion is gained that there are parameters made AUUB estimator is better than OLS estimator in terms of their mean square error. The sufficient and necessary condition that AUUB estimator is admissible is given. The ellipse is given that AUUB estimator is

然后给出了几乎无偏统一有偏估计的定义，该定义包括了文献中常见的几乎无偏估计，实现了常见几乎无偏估计的统一表达式；接下来我们比较了几乎无偏统一有偏估计与统一有偏估计的偏度与方差，得出了几乎无偏统一有偏估计比统一有偏估计有较小的偏度，几乎无偏统一有偏估计的方差介于统一有偏估计的方差与统一有偏估计的方差的四倍之间的结论；最后我们对统一有偏估计的主要性质作了讨论，证明了存在参数K，S使得几乎无偏统一有偏估计在均方误差意义下优于最小二乘估计的结论，给出了几乎无偏统一有偏估计为可容许估计的充要条件，还给出了在均方误差阵意义下几乎无偏统一有偏估计优于最小二乘估计的椭球。

Number of loaded circuits DN Value Preload Method for Providing a Preload Applied preload 1row 2.50 turns 70000 Yes fixed point preload 4055 Type of guide Shaft process method Ball cage Splined portion Hollow shaft Ball Precision None None None Recommended support unit on the Fixed Side type Recommended support unit on the Supported Side type Types of Nuts Threading direction Spacer ball None None Double-nut Right-hand, left-handmust be check...

载荷钢球圈列数 DN值预压预压方法预压负荷 3列 2.50圈 70000 有定位置预压 4545 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Number of loaded circuits DN Value Preload Method for Providing a Preload Type of guide 4 rows 1.50 turns 70000 None None Ball Shaft process method Ball cage Splined portion Hollow shaft Recommended support unit on the Fixed Side type Precision None None None BK30,FK30 Recommended support unit on the Supported Side type Types of Nuts Threading direction Spacer ball Rigidity in the axial direction BF30, FF30 Single nut Right-hand, left-hand...

载荷钢球圈列数 DN值预压预压方法导轨型号 2列 1.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK30，FK30 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF30， FF30 单一螺帽右螺纹，左螺纹，左右螺纹无 400.0 螺纹条数。。。

Number of loaded circuits DN Value Preload Method for Providing a Preload Type of guide 3 row 1.50 turns 70000 None None Ball Shaft process method Ball cage Splined portion Hollow shaft Recommended support unit on the Fixed Side type Precision None None None BK30,FK30 Recommended support unit on the Supported Side type Types of Nuts Threading direction Spacer ball Rigidity in the axial direction BF30, FF30 Single nut Right-hand, left-handm...

载荷钢球圈列数 DN值预压预压方法导轨型号 3列 1.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK30，FK30 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF30， FF30 单一螺帽右螺纹，左螺纹，左右螺纹无 600.0 螺纹条数。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 16 81.1 231.3 14.61 20.85 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with...

载荷钢球圈列数 DN值预压预压方法预压负荷 2列 2.50圈 70000 有定位置预压 4370 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 5 23.7 84.7 1.69 9.06 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ att...

载荷钢球圈列数 DN值预压预压方法导轨型号 2列 1.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK30，FK30 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF30， FF30 单一螺帽右螺纹，左螺纹，左右螺纹无 400.0 螺纹条数。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 10 26.1 56.2 2.2 4.98 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ att...

载荷钢球圈列数 DN值预压预压方法导轨型号 1row 3.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK20，EK20，FK20 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF20， EF20， FF20 单一螺帽右螺纹，左螺纹，左右螺纹无 440.0 螺。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 4 5.1 10.5 0.32 1.35 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ atta...

载荷钢球圈列数 DN值预压预压方法导轨型号 1row 2.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK12，EK12，FK12 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF12， EF12， FF12 单一螺帽右螺纹，左螺纹，左右螺纹无 190.0 螺。。。

Stroke Lead Ball center-to-center diameter Basic load rating Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm mm mm kN kN kg kg/m 100 10 8.4 2.16 3.82 0.049 0.30 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diamee...

载荷钢球圈列数 DN值预压预压方法导轨型号 2列 1.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 EK6， FK6 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 EF6， FF6 单一螺帽右螺纹无 100.0 螺纹条数防尘措施防尘罩形式 W清洁环与QZ润滑装置配用。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 10 27.6 63.3 2.75 6.51 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ at...

载荷钢球圈列数 DN值预压预压方法导轨型号 2列 2.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK25，FK25 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF25， FF25 单一螺帽右螺纹，左螺纹，左右螺纹无 680.0 螺纹条数。。。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。