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【单选题】
关于船舶自救行动,下述说法正确的是_____。1碰撞、触礁等海事导致船体破损进水,主要精力放在堵漏和排水;2进水速度较快,难以控制时,应考虑选择适当的水域实施抢滩;3火灾或爆炸,应立即按照应急部署表组织船员灭火,并尽可能驶离会危及邻近船舶和设施的水域;4应变措施实施。
A.
①②
B.
②③
C.
①②③
D.
①③
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A.
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B.
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C.
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D.
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A.
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B.
企业没有建立网站,即使接人互联网,也无法开展网络营销活动
C.
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D.
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【简答题】平面与立体表面的交线称为 。
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