单选题
发布日期:2021-03-22
transfer heat from the cylinder to the piston
scrape oil from the sides of the piston
seal the combustion space from the crankcases
prevent any piston contact with the cylinder liner
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志愿者参与志愿服务的方式与类型的多元化具体体现在( )。
岩石的密度对爆破有何影响?为什么?
菌核和菌索
做胶砂流动度时,跳桌可跳动部分的落距门为8±0.2mm。
青海省的循化孟达林区被誉为( )。
制定教学计划的首要问题是()。
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在甲亢患者的心律紊乱中较为常见的是:()
有动力附挂回送机车,除受桥梁限制必须进行隔离的区段外,应挂于本务机车次位,回送时不得超过机车最高允许运行速度。
0,0,6,24,60,120,( )。
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