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Plastic should lower 3 steps, because plastic is a step to add meltresin material to cyclinder , Higher stick of resin material ,higher screwback pressure. Screw speed differs depending on decomposing temperatureof resin material ,Higher screw speed ,Higher trim force of resin,higher cyclinder temperature. Some resin material may decomposes so it setscrew speed in mid-speed such as 45-75%, In plastic step setting screwback pressure is very important, Higher screw back pressure ,higherquality of product screw back pressure make resin structure order, Moldingproduct is beautiful and volume stable. But ,it maybe flow if screw

再复杂的熔胶旋转过程最多不会超过三段，因为熔胶本身就是存在于把胶熔进料筒的过程，如果原料粘度大，熔胶压力则大，但速度则应取决于原料的分解温度，熔胶速度越快，原料中的剪切力则会越大，料管温度则越高，局部原料产生分解的可能性则会越大，故一般熔胶会采用中速为宜，如45%-75%，熔胶同时会碰到一个比较重要的环节，那就是背压的使用，产品精度要求越大，背压的使用则更大，背压可使原料分子间结构更紧密，成型出的产品则尺寸更稳定，外观越好。

In the cold wind, Brandt went step by step the victims of the tombstone, under the watchful eyes of the world, the World War II Nazi anti-heroic fighter, made a shock to all of the action: He knelt Down to the ground.

在冰凉的风中，勃兰特一步步走到死难者的墓碑前，在全世界的注视下，这位二战中反纳粹的英勇斗士，做出了一个令所有人震惊不已的动作：他跪倒在地。

Step to one side then step back to where you started fromHere we go,everybody dance to the music.

踏向一边然后踏回你开始的地方）让我们开始，每一个人合着音乐跳舞。

If you want to go up a hill, you have to stand sideways, and go up step by step.

如果你想上山，你得侧着身子，一步一步地向上走。

Stainless steel table and stool (which can take-off and landing), experimental workbench, stainless steel console, stainless steel recording units, interlocking umbrellas frame (12, 18, 24), stainless steel step by step, stainless steel mop frame, circular outdoor dustbin, barrel racks, and racks, five flower grid shelves, stainless steel carts (the second floor; three), stainless steel floor drain, stainless steel flow plate, stainless steel powder are summarized, stainless steel ladle, stainless steel buckets, volume stainless steel barrels, stainless steel barrels, stainless steel bucket trucks, stainless steel sieve sampling tube, stainless steel oil pump, stainless steel frame name, stainless steel isolation frame, such as stainless steel spatula.

不锈钢桌子，凳子、实验工作台、不锈钢操作台、不锈钢记录台、带锁雨具架（12头，18头，24头）、不锈钢步步高、不锈钢拖把架、户外圆形垃圾桶、桶架、地架、五层花格货架、不锈钢推车、不锈钢地漏、不锈钢周转盘、不锈钢粉撮、不锈钢舀子、不锈钢水桶、不锈钢容积桶、不锈钢桶、不锈钢桶车、不锈钢筛取样管、不锈钢油抽、不锈钢品名架、不锈钢隔离架、不锈钢铲等。

The systematic error models established in the paper are rigid rotation model, volumetric strain model, homogeneous deformation model and heterogeneous deformation model. The recognition of systematic models is carried step by step from the complex to the simple by hypothesis tests.

所建立的系统偏差模型有刚体转动模型、体应变模型、均匀形变模型和非均匀形变模型，模型的确认通过假设检验方法由复杂模型形式向简单模型形式逐步进行。

When children speakwe must ask them to go on until they finish, then sing high praise for their performance to make them have confidence in themselves, and give them some necessary help. So that they can develop and improve themselves step by step .

当孩子说英语时，我们决不能打断他们的话，必须要他们说完，然后高度赞扬他们表现，以便他们对自己充满信心，之后在给予他们适当的帮助，以便他们能循序渐进地发展和完善自我。

All single step method and CTAB method did not work well when banana total RNA was isolated, unless modified single step method was used, in which, polysaccharide was removed by aether extraction prior to RNA precipitation.

对于富含多糖的香蕉果肉，一步法和CTAB异硫氰酸胍法的效果均不理想；改良后的一步法中增加了乙醚去除多糖并获得了较好的效果。

As to system＇s uncertainty such as time varying characteristics, grey multiple step error correction method took the place of the conventional single step error correction method.

针对对象特性时变等不确定因素，该文以灰色多步误差预测校正替代原有算法的当前一步误差校正，可以更为有效的克服模型失配等因素的影响。

As to system s uncertainty such as time varying characteristics, grey multiple step error correction method took the place of the conventional single step error correction method. The new method could effectively overcome the bad influence of some factors such as model mismatch.

针对对象特性时变等不确定因素，该文以灰色多步误差预测校正替代原有算法的当前一步误差校正，可以更为有效的克服模型失配等因素的影响。

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。