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问题:

[多选] 冲裁工艺变形过程的三个阶段()。

A . 弹性变形阶段
B . 塑性变形阶段
C . 断裂阶段
D . 回弹阶段

探火人员进入火场解救受困人员时,应先搜索门后、舷窗及梯口等附近,因为被困人员往往集聚在上述处。 违反计量法律、法规使用非法定计量单位的,责令其停止销售,可并处一千元以下罚款。() A vessel proceeding along a narrow channel shall(). avoid crossing the channel at right angles。 not overtake any vessels within the channel。 keep as near as safe and practicable to the limit of the channel on her starboard side。 when nearing a bend in the channel,sound a long blast of the whistle。 A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way? () The vessel moving upstream against the current。 The vessel moving downstream with a following current。 The vessel located more towards the channel centerline。 The vessel with the least amount of maneuverability。 机舱或其它舱室着火,火势迅猛,人员根本无法接近,最好的灭火战术是“防护周围”。 冲裁工艺变形过程的三个阶段()。
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