单选题
发布日期:2021-03-22
the piston rods
the crank throws
the thrust bearings
the main bearings
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试分析活塞环的密封原理。
属于中枢免疫器官的是( )。
李老师给参加数学竞赛获奖的同学买奖品,用268.8元买了12枝钢笔,每枝钢笔是()元。
向下级机关的重要行文,应当同时抄送发文机关的直接上级机关。
检查止水带安装的纵向位置,通常止水带以施工缝或变形缝为中心(),用钢卷尺检查,要求止水带偏离中心不能超过3cm。
职工因工死亡,其直系亲属有权从工伤保险基金中领取()。
施工单位应当自施工起重机械和整体提升脚手架、模板等自升式架设设施验收合格之日起()内,向建设行政主管部门或者其他有关部门登记。
班前活动的安全交底主要内容是()。
委托生产的产品质量及销售由谁负责?
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