电泳涂装工艺的最后一道去离子冲洗水的电导率不应高于（）us/cm

A:10 B:20 C:30 D:25

PCM30/32路帧结构中，每路时隙宽度为（）us。

A:0.488 B:3.91 C:125 D:25

在ATM－N帧结构中，帧频为8KHz，一帧的周期为（）us。

A:25 B:125 C:120 D:225

铝中声速约为6．25×103m/s，声速通过25mm铝的时间约为（）。

A:1/8s B:4us C:4ms D:O.25us

The high living standards of the US cause its present population to ______ 25 percent of the world's oil.

A:assume B:consume C:resume D:presume

The company director has informed us that we must _____department budge by 25%

A:cut down B:cut away C:cut off D:cut up

根据《建筑设计防火规范》(GB 50016-2006)的规定，下列关于备用泵设置的说法中，错误的是()。

A:工厂和仓库的室外消防用水量为25Us，可不设备用泵 B:堆场和储罐的室外消防用水量为20L/s，可不设备用泵 C:建筑的室内消防用水量为15 L/s时，可不设备用泵 D:建筑的室内消防用水量为lOL/s时，可不设备用泵

The teacher told us yesterday that December 25^th _______ Christmas Day.

A: is B: was C: has been D: will be

25. Most of us think ______ important to know how to get well along with others.

A: it B: 不填 C: that D: this

25. Mike _______ have known the solutions to this problem, or he would have told us.

A: mustn’t B: shouldn’t C: can’t D: needn’t