查询词典 D.A.

In present engineering point of view, accurate conversion of A/D converter can't realize which is made of unstable system.

从目前的工程观点来看，一个本身不稳定的A/D变换器是不可能用来进行精确的A/D变换的。

Definition 4 Let D be the domain of the function of two variables , be a point of accumulation of D.

定义4 设二元函数的定义域为D，是D的聚点。

Definition 3 Let D be the domain of the function of two variables, be a point of accumulation of D and .

定义3 设二元函数的定义域为D，是D的聚点，且。

The same advice emerged from a review of 2,750 studies published in May by University of California professor Cedric Garland who said that increasing vitamin D intake to 2,000 IU a day could cut breast cancer rates by a quarter and bowel cancer by a third.

维生素D是激素和，因此那些是非常好的与胰岛素融合的性致。同样的忠告从在5月出版的2，750项研究做了回馈，说明一天摄入2000IU的维生素D可能减少肠癌症和乳腺癌的几率。

In Fig.1,spindle A is supported by two identical isotropic bearings in radial direction;spindle A and drill clamp C–D is connected by shaft B;micro-drill E–F is fixed in the clamp D.Drill part with the screw slots is taken as uniform shaft F by equivalent of the bending stiffness.

In ，主轴A是帮助的两个相仿的各向同性轴承径向目标；主轴A和操演钳的C - D的贯串轴B组；微型钻电子F是牢固在钳4钻局部螺钉插槽是采用调和轴F很是卷曲stiffness。

In Fig.1,spindle A is supported by two identical isotropic bearings in radial direction;spindle A and drill clamp C D is connected by shaft B;micro-drill E F is fixed in the clamp D.Drill part with the screw slots is taken as uniform shaft F by equivalent of the bending stiffness.

In ，主轴A是支持的两个相同的各向同性轴承径向方向；主轴A和演习钳的C - D的连接轴B组；微型钻电子F是固定在钳4钻部分螺钉插槽是采取统一轴F相当弯曲stiffness。

Having studied the digital down-conversionprocess of IF signal before the base band process which follows A/D conversion in wireless communication,the paper puts forward a new idea of utilizing the FPGA to realize multi-channel digital signal DDC.Through analyzing the features and performances of CIC filters,HB filters and multiphase-filter,we combine them with decimators and decimate the A/D data,thus reducing the digital signal rate and the load of DSP when processing the base band signal.

软件无线电技术是在通用的开放式无线电智能平台上，通过安装不同的软件来完成各种通信功能，其结构的基本特征之一就是使A/D变换尽量靠近射频端，目前的方案是在中频对模拟信号进行数字化，对中频数字信号进行下变频处理，使数字信号量降低到高速DSP能够处理的程度[1]。

Point of the Island, I was perfectly confounded and amaz'd; nor is it possible for me to express the Horror of my Mind, at seeing the Shore spread with Skulls, Hands, Feet, and other Bones of humane Bodies; and particularly I observ'd a Place where there had been a Fire made, and a Circle dug in the Earth, like a Cockpit, where it is suppos'd the Savage Wretches had sat down to their inhumane Feastings upon the Bodies of their Fellow-Creatures.

好久好久，我忘记了自身的危险。想到这种极端残忍可怕的行为，想到人性竟然堕落到如此地步，我忘记了自己的恐惧。吃人的事我以前虽然也经常听人说起过，可今天才第一次亲眼看到吃人留下的现常我转过脸去，不忍再看这可怕的景象。

Kurarinone group of 62 patients (M30, F32; age 43 a±s 9 a) was treated with kurarinone 200 mg, im, bid for 10-30 d and control group of 42 patients (M 22, F 20; age 43 a±7 a) was treated with 10% calcium gluconate 10 mL, vitamin C 1.0 g, 25% glucose injection 20 mL, iv, qd for 10-30 d. The results were compared by statistics of Chi-square test.

选择各型湿疹病人104人，分为苦参素组62例和葡萄糖酸钙对照组42例，分别用苦参素注射液200 mg， im， bid和10%葡萄糖酸钙注射液10 mL，维生素C 1.0 g，25%葡萄糖注射液20 mL，iv， qd；2组均以10 d为一个疗程(各1～3疗程)。

Groundbreaking research by two french geophysicists promises to shed some light on the mystery.using 80 metres of deep sea sediment core, they have obtained measurements lots of magneticfield intensity that span 11 polarity reversals and four million years.the analysis reveals that intensity appears to fluctuate with a clear, welldefined rhythm.although the strength of the magnetic field varies irregularly during the short term, there seems to be an inevitable longterm decline preceding each polarity reversal.when the poles flip―a process that takes several hundred thousand years―the magnetic field rapidly regains its strength and the cycle is repeated.

答案为d。这一题目是根据上下文判断词意的题。flip的意思是&快速翻转&，它所在的句子的意思是&当两极互换――这一过程需要上万年的时间――磁场会很快重新恢复它的强度，新的一轮循环又开始了。&因此在四个选项中： a.decline的意思是&拒绝；变小、变弱&，b.intensify的意思是&变得更强烈、加剧&，c.fluctuate的意思是&涨落、波动&；d.reverse的意思是&使反转、倒退、颠倒&，例如：writing is reversed in a mirror。写出来的字在镜子里是颠倒的。d的意思与flip最接近。

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。