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【单选题】
输入直流电压，先通过功率开关管的通断把直流电压逆变为占空比可调的高频交变电压加在变压器初级绕组上，然后经过变压器变压、高频整流和滤波，输出所需直流电压的是（）开关电源A.
隔离型
B.
谐振型
C.
非隔离型
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举一反三
【单选题】Hurry up, he is sure _____________ for us.
A.
to wait
B.
to be waiting
C.
waiting
D.
being waiting
【单选题】听力原文：M：Hurry up, Linda! I hear that there aren't many tickets left for the football match. W：I am ready now. Let's go. It is the early bird that catches the worm. Q：Why did the man ask the woman to hu...
A.
He didn't want to warm up for the game.
B.
He didn't want to be held up in traffic.
C.
He wanted to make sure they got tickets.
D.
He wanted to catch as many birds as possible.
【单选题】Hurry up, he is sure ______ for us.
A.
to wait
B.
to be waiting
C.
waiting
D.
being waited
【简答题】实学思潮是适应明末清初社会变迁而兴起与发展的,它是时代的产物,代表着时代的精神,具有启蒙___________的意义。
【单选题】Nancy: Hello, Ted. What's wrong with your arm? Ted: I broke it when I was skating on the holiday. Nancy: Oh, no! ______. Ted: Much better, thanks.
A.
What a nuisance!
B.
How awful!
C.
Why was that7
D.
What a trouble!
【简答题】动词填空 用括号内所给动词的适当形式填空。（本大题共8分，每小题1分） 小题1:They _________ a series of pre-recorded tapes to the language laboratory in the past 2 days. (send) 小题2:Remember that teaching others is ________ yourself. (tea...
【简答题】We should __________(培养...的习惯)working with our own hands from our childhood.
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