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【单选题】
一般循环淡水冷却的柴油机中缸套穴蚀主要由 引起。A.
空泡腐蚀
B.
电化学腐蚀
C.
低温腐蚀
D.
应力腐蚀
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【简答题】How is his Criminal Law course? It is ______ .
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【单选题】— He can't find his hat. Have you seen it? — Yes, of course. I _____ it on his bed just now. [ ]
A.
saw
B.
have seen
C.
had seen
D.
to see
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【简答题】晶体在不同晶向上的性能是（），这就是单晶体的各向异性现象。一般结构用金属为多晶体，在各个方向上性能近似相同，这就是实际金属的（）现象。
【单选题】David said that it was because of his strong interest in literature ________ he chose the course.
A.
that
B.
what
C.
why
D.
how
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