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【单选题】
()式汽车转向器传动效率较高,可达90%~95%,且转向操纵轻便,零件使用寿命长。A.
循环球
B.
蜗杆指销
C.
齿轮齿条
D.
蜗杆蜗轮
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举一反三
【单选题】听力原文：W: Professor Hook was so strange today. M: I noticed that too. He was talking so quietly and then not giving us any homework at all. Can you believe that? Q: What can be inferred about Professor ...
A.
He usually talks quietly.
B.
He usually assigns homework.
C.
He didn't come to class today.
D.
He came to class late today.
【简答题】A．ignored B．neglected C．remembered D．noticed
【简答题】A．ignored B．neglected C．remembered D．noticed
【简答题】A．talked B．handled C．watched D．noticed
【简答题】A．ignored B．neglected C．remembered D．noticed
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