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【单选题】
半常采用()作平衡阀。A.
单向顺序阀
B.
溢流阀
C.
减压阀
D.
背压阀
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反馈参考答案：
举一反三
【简答题】微型计算机诞生于第几代？
【单选题】What is the main problem?
A.
He doesn't know what color his friend likes in a gift.
B.
His friend has a broken knapsack.
C.
The gift he wants isn't there.
D.
He doesn't know what his friend will find useful in a gift.
【单选题】In the ________ of the race between the tortoise and the hare, the tortoise wins, even though he is slow, because he keeps going with determination.
A.
fable
B.
tale
C.
story
D.
saga
【简答题】Mark Twain was an American writer.One day he went to a city by train.He wanted to see one of his friends there.He was a very busy man.He usually forgot something.When he was in the train, the conducto...
【单选题】When he heard the _______ news that an earthquake occurred in Sichuan, he felt very___________.
A.
frightened; frightened
B.
frightened; frightening
C.
frightening; frightening
D.
frightening; frightened
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