【单选题】电流的大小和方向都不随时间变化而变化的物理量称( )。
【简答题】仅有一个血清型,病后有牢固的免疫力的呼吸道病毒有 、 和 。
【简答题】开关合上后熔断器熔丝烧断,不可能的原因是( )。(5.0分)A. 灯座内两线头短路 B. 螺口灯座内中心铜片与螺旋铜圈相碰短路 C. 线路发生断路 D. 无法判断
【多选题】Which of the following is the correct English equivalent of "我们只能以牺牲质量为代价来提高产量,但这可能会损害公司的声誉。" There are may be more than one correct sentence.
A.
We can only increase production at the expense of quality which could ruin the company's reputation.
B.
We can only increase production at the expense of quality, which could ruin the company's reputation.
C.
We can only increase production at the expense of quality, which should harm the company's reputation.
D.
We can only increase production at the expense of quality, which may harm the company's reputation.
【判断题】交流电和直流电的区别是:直流电的大小和方向是不随时间的变化而变化;交流电的方向和时间都随时间的变化而变化。
【简答题】简述函证的涵义及确定应收账款函证的数量和范围要考虑的因素
【简答题】以牺牲 ... 为代价 at the ________ of
【判断题】凡大小和方向都随时间变化的称为直流电流;凡大小和方向都不随时间变化的电流称为交流电流。