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【单选题】
凸轮机构中从动件的运动规律取决于( )。A.
凸轮的大小
B.
凸轮的形状
C.
凸轮的转速
D.
凸轮的材质
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举一反三
【单选题】There is no doubt that we are living in a period of enormous population growth. In the past, it (51) thousands of years for the world's population to double in size. (52) today there are more people h...
A.
spent
B.
cost
C.
took
D.
consumed
【单选题】What are highly respected in big cities?
A.
Air-conditioned houses.
B.
Living conditions.
C.
A few flowers and a few leaves.
D.
Sunshine and fresh air.
【单选题】There is no doubt that we are living in a period of enormous population growth. In the past, it(51)thousands of years for the world's population to double in size.(52)today there are more people havin...
A.
spent
B.
cost
C.
took
D.
consumed
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