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【单选题】
电压的基本特点是通过调节晶闸管( )使输出电压平滑调节,实现无级调压。 A、两端电压 B、电流 C、控制角A.
Ａ、两端电压
B.
Ｂ、电流
C.
Ｃ、控制角
D.
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【简答题】读课文，写一写。 1. An email is a message. It goes from _______________. 2. To write an email, you should click on ' __________ '. 3. After you write your message, you should click on ' _ _________ '. 4. ...
【单选题】Please turn off the computer after you finish ______ the email.
A.
write
B.
to write
C.
writing
【单选题】If you write something and send it immediately by email, which you _______ later regret, there is no chance for second thoughts. [ ]
A.
would
B.
should C . have to D. might
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【单选题】Please turn off the computer after you finish ______ the email.
A.
write
B.
to write
C.
writing