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【单选题】
下列关于电场强度说法正确的是A.
电场强度的单位是牛每米，N/m
B.
电场强度的正电荷在该点受到的电场力的方向。
C.
电场强度是标量，没有方向。
D.
电场强度的大小受到检验电荷的影响。
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【单选题】Though scientists are dubious about some experiments, they believe that______.
A.
the body's minimum temperature comes during the deepest sleep, typically at around 5 a.m.
B.
by attempting to get warmer than usual, the rats must want to trigger sleep-inducing neurons
C.
part of the function of sleep is to cool down the brain
D.
hibernation in this daily period benefits animals
【多选题】下列关于学校产生后历史进程说法正确的是()
A.
历史发展到18世纪，西方社会出现文科中学，现代意义上的学校形成
B.
.文科中学是以古典人文主义教育为特征的
C.
文科中学偏重于传授拉丁文和希腊文
D.
.在19世纪下半期，严格意义上的学校教有系统在西方已形成
【简答题】完形填空 Most s want to return to their childhood, because they believe how happy it is to be a child. But they forget that times have changed a great deal, and they never honestly change places ...
【单选题】Why are many people unwilling to “play the game” （Line 4, Para. 5）?
A.
They believe that doing so is impractical.
B.
They feel that such behavior. is unprincipled.
C.
They are not good at manipulating colleagues.
D.
They think the effort will get them nowhere.
【单选题】如图1) 所示,给出了电压和电流的相量图,从相量图可知( )。
A.
有效值 U ＞ I
B.
电流电压的相位差为 15 °
C.
电流超前电压 75 °
D.
电压的初相为 30 °
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