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[单选] If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place,().

A . the relief of that officer shall be made prior to such action has been completed
B . the relief of that officer shall never be made
C . the relief of that officer shall be deferred until such action has been completed
D . the relief of that officer shall be made by the captai

西方主要资本主义国家的领导体制主要是实行()。 独裁专制。 民主集中制。 民主共和制。 分权制衡制。 买卖合同的标的物的所有权一般自()起转移。 价款支付时。 标的物交付时。 合同成立时。 标的物托运时。 提高蜗杆传动效率的最有效方法是()。 增加蜗杆头数。 增加直径系数。 增大模数。 减小直径系数。 If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will() backfire through the air intakes。 develop less power under load。 have high firing pressures。 lift its cylinder relief valve。 在棉织物的前处理过程中用量最多的化学药品是() A.烧碱。 B.纯碱。 C.硫酸。 D.双氧水。 If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place,().
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