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【单选题】
链轮两轴线必须 否则会加剧链条和链轮的磨损,降低传动平稳性,并增加噪音。A.
垂直
B.
平行
C.
同轴
D.
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反馈参考答案：
举一反三
【单选题】In the third paragraph, the phrase \"with the upper hand\" mea
A.
In the third paragraph, the phrase ///////"with the upper hand///////" means A．being low in spirit
B.
having only one hand
C.
being active
D.
being passive
【单选题】The secrets of sleep were a mystery for centuries simply because there was neither the means (51) them, nor the need. Only when candles gave way (52) gaslight, and gas to electricity, when man became ...
A.
investigate
B.
to investigate
C.
explore
D.
to explore
【简答题】______ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns. A. Put B. Putting C. Having put D. Being put
【简答题】Somewhere in our early education we become addicted to the notion that pain mea sickness. We fail to learn that pain is the bodys way of informing the mind that we are doing something wrong, not neces...
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