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【简答题】
已知示波器的偏转因数为0.1V/div，时基因数为0.1ms/div；被测信号为正弦波，“×10”挡接入示波器。测得屏幕上该信号的波形总高度为8div，一个周期为5div，试求被测信号的频率f、峰峰值UP-P、振幅Up、有效值Urms。
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【单选题】— Would you please carry the big box for me, Kang Kang? — ______. [ ]
A.
No problem
B.
What a pity
C.
Not at all
D.
Thank you
【简答题】听录音，写出你听到的单词。 Wu: What's your ____________? John: I like ____________ ____________. What about you? Wu: Me too. There is a stamp show on Sunday. Let's go together. John: I have a ____________. He like...
【单选题】Angry with Wu Kang's impatience, the Jade Emperor punished Wu Kang to the Moon Palace and told him that he must cut down a huge cassia tree before he could _____________.
A.
have a meal
B.
return to earth
C.
have a rest
D.
go to sleep
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