• 2022-06-06
    The camshaft is used to open and close the valves with the motion of the pistons.
  • 正确

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      The reciprocating motion of the pistons is changed to rotary motion as the crankshaft spins. 这句话的意思是旋转运动就转化为活塞的往复直线运动。 A: 正确 B: 错误

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      In terms of scope or range, debate motions fall into three categories: open motion, closed motion and semi-closed/semi-open motion.

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      Could you _____the window? I feel a little cold. A: please not open B: please not to open C: not please to close D: please not to close

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      The slotting machine is mainly used for machining the inner surface of the workpiece, and the main motion is the vertical reciprocal rectilinear motion of the tool.

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      Whenyou _____ home,youcan _____thebreadassoonasyou _____ thedoor. A: come;look;open B: come;smell;open C: go;smell;close D: come;look;close