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【单选题】
对于汽车的曲柄连杆机构描述正确的是A.
由曲柄直接带动活塞运动
B.
由曲柄带动连杆，连杆带动活塞运动
C.
由活塞带动连杆转动
D.
以上都不对
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【单选题】下面关于设计描述不正确的一项是:()
A.
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B.
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C.
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D.
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A.
He gets ill at the same time every year.
B.
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C.
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D.
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