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【单选题】
按结构和性能分,起重设备可分为( )。A.
轻小型起重设备、门桥类起重设备、臂架类起重机
B.
吊钩起重机、抓斗起重机、电磁起重机、吊钩抓斗起重机等
C.
港口起重机、船上起重机、货场起重机、仓库起重机等
D.
随车起重机、车间起重机、建筑起重机等
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【单选题】听力原文：W: Why is Bob so tired and worn out'? M: He's been studying day and night for his final term paper! I have warned him many times to prepare earlier, but he would not listen. What does the man mea...
A.
Bob is too tired to study any more.
B.
He told Bob not to study late at night.
C.
He had often advised Bob to prepare earlier.
D.
Bob didn't hear the warning.
【简答题】Why is he so tired? He (play) basketball for five hours.
【多选题】以下关于需求价格弹性大小与销售收入的论述中，正确的是( )。
A.
需求弹性越大，销售收入越大
B.
如果商品富有弹性，则降价可以扩大销售收入
C.
如果商品缺乏弹性，则降价可以扩大销售收入
D.
如果商品富有弹性，则降价可以提高利润
E.
如果商品为单位弹性，则价格对销售收入没有影响
【简答题】Why is he so tired?
He (play) _______________ tennis for five hours.
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