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【单选题】
铸铁在纯剪应力状态下破坏,此时引起材料弹性失效的力学原因是( )A.
拉应力引起的拉断
B.
压应力引起的剪断
C.
剪应力引起剪断
D.
都可能
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【单选题】—Did you find the small village where you once worked? —Yes, without any difficulty, for it has ________ changed over years. [ ]
A.
hardly
B.
greatly
C.
clearly
【判断题】Folk tales say the game originates from the activities of seeking Qu Yuan's body, but experts, after painstaking and meticulous research, conclude that dragon boat racing is a semi-religious, semi-ent...
A.
正确
B.
错误
【单选题】It’s said that there are plenty of hotels in Shanghai. There _____ be any difficulty for you to find somewhere to stay.
A.
wouldn’t
B.
shouldn’t
C.
mustn’t
D.
needn’t
【单选题】You must phone the police when you find any suspicious guy _________ the house late at night.
A.
hanging out
B.
hanging up
C.
hanging round
D.
hanging together
【简答题】And experts say a______ can actually be a serious problem.
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