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【简答题】
所有的采暖系统都是由以下三个主要部分组成____、____、____。
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【多选题】有一交流电 ,加在电感L为100mH的电感线圈两端,下面叙述正确的是
A.
流过电感的电流的初相位是零度。
B.
流过电感的电流最大值是12.1A
C.
感抗XL是31.4Ω。
D.
流过电感的电流瞬时值表达式为
【判断题】True or false.Someday sloppy people will put everything in order, getting round to doing everything they've included on their agenda,
A.
正确
B.
错误
【简答题】若正弦电压u=220 sin100πtV加在电感勾L=0.0127H的线圈上，试求电感元件的无功功率。
【简答题】线性电感元件是指电感量L为______的电感。
【单选题】Read the text of UNIT 2 Neat People vs. Sloppy People, what's the writer's purpose of writing this passage?
A.
Compare the differences between neat people and sloppy people
B.
Discuss the causes of difference between neat people and sloppy people
C.
To disprove the conventional attitudes toward neat people and sloppy people
D.
Criticize neat people for their insensitivity.
【单选题】Which of the following is the author's attitude towards a sloppy and indulgent culture?
A.
He is in favor of it.
B.
His view is balanced.
C.
He is slightly critical of it.
D.
He is strongly critical of it.
【简答题】某电感线圈，两端电压为 ，电流为 ，试求该线圈电阻R和电感L。
【单选题】According to the passage, sloppy writing ______.
A.
parallels a social tendency of being informal
B.
worries students as well as professors
C.
is taken as trivial by employers
D.
is ignored in all business concerned sciences
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