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【简答题】
_____是施工的关键构造, _____是转体施工成败的关键。
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【单选题】已知 u 1 =60sin(314t+90°)V ， u 2 =80sin(314t)V ，则 u 1 - u 2 = （ ）。
A.
u 1 - u 2 =20sin(314t)V
B.
u 1 - u 2 =-20sin(314t)V
C.
u 1 - u 2 =100sin(314t+143.1°)V
D.
u 1 - u 2 =-20sin(314t-143.1°)V
【简答题】reading单词复习 翻译 1 . As we all know, the industrial revolution took place in England first. 2 . She has the potential ( ) to become a worldclass pianist. 3 . People bite food, chew ( ) it and swallow b...
【简答题】名词复数练习题 一、填入所给名词的正确形式。 1. I have two (knife)______. 2. There are many (box)______here . 3. There are many(bus)______ on the road. 4. A few(boy) _____are drawing on the wall. 5. The(child)____are playi...
【简答题】习题11-11图示电路，已知u 1 =400+100sin(3×314t)-20sin(6×314t)V，求电压u 2 。
【简答题】7上U8背默.docx 2. 复习,背默3组句子 1) I can also play soccer. = I can play soccer, too.我会...我也会... 2)-- What club do you want to join? 你想要参加什么俱乐部? -- I want to join the music club. 我想参加音乐俱乐部。 3)-- ...
【简答题】已知u=220sin( 314t + 20°) V , i=10sin( 314t - 30°) A, u (超前/滞后)i。
【单选题】已知 u 1 =60sin(314t+90°)V ， u 2 =80sin(314t)V ，则 u 1 + u 2 = （ ）。
A.
u 1 + u 2 =140sin(314t)V
B.
u 1 + u 2 =100sin(314t)V
C.
u 1 + u 2 =100sin(314t+36.9°)V
D.
u 1 + u 2 =140sin(314t-36.9°)V
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