问题
问答题 简答题
试述蒸汽吊车润滑的重要性。
答案
参考答案：
使机械的摩擦力减少到最低限度，节省原动力；机械的磨耗减少到最低限度，不但能保持正确的机械运动，而且能减少机械检修费用和运用费，并能延长机械使用寿命；可充分发挥机械效能。
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试述蒸汽吊车润滑的重要性。
参考答案：
使机械的摩擦力减少到最低限度，节省原动力；机械的磨耗减少到最低限度，不但能保持正确的机械运动，而且能减少机械检修费用和运用费，并能延长机械使用寿命；可充分发挥机械效能。
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| Halloween falls __1__ October 31 st. It is one of the most favourite holidays for __2__ in the USA. People __3__ in costume like a witch, a ghost or a skeleton. The children go to houses __4__ "trick or treat". Long ago, __5__ a child was not good, he or she would get a trick like __6__ a stone in his or her bag instead of some candy. Parties are also popular __7__ the evening. People go to parties __8__ costumes and play different __9__ . People also like __10__ to ghost stories and watching scary movies. | |||
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