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【简答题】
二极管最大的特点是( )。
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举一反三
【单选题】You ______ him the news it just made him sad.
A.
don't need to tell
B.
didn't need to tell
C.
needn't tell
D.
needn't have told
【单选题】The man _____ was a friend of mine. [ ]
A.
you just talked to
B.
whom you just talked to him
C.
who you just talked to him
D.
which you just talked to
【单选题】如图所示,一重物重为G,置于粗糙斜面上,物块上作用一力F,且F=G。已知斜面与物块间的摩擦角为 25o 。物块能平衡的情况是( )。
A.
都能平衡
B.
（ａ）、（ｃ）可以平衡
C.
（ｂ）可以平衡
D.
都不能平衡
【简答题】影响舒张压的主要因素是
【单选题】I forgot ______ a letter to him, so I wrote to him just now.
A.
writing
B.
having wrote
C.
to have written
D.
to write
【单选题】If a person buys a video game system, it is logical to think he needs a game. Offer a specific game to him instead of just asking him if he needs anything else to go with his system. What’s the sellin...
A.
Discounting.
B.
Up-selling.
C.
Buying one, and getting one free.
D.
All goods, half price.
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