正确答案: B

5/2/3

题目：保持船级的水管锅炉的内部检验每______年内不少于______次，最大间隔期不超过______年。

解析：B

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举一反三的答案和解析：

[单选题]避让行动有效性的核查适用于下列哪些船舶？________。

A+B+C

[单选题]撕裂伤口的特征是______。

创缘多不规则，对周围组织破坏较重

[单选题]Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

compression must be low to prevent pre-ignition

[单选题]使用1211灭火器，应喷向火的什么部位？

火的根部

[单选题]Who ________ you? I’m a sailor

are

[单选题]硅胶管消毒灭菌不能用：

70%酒精浸泡

[单选题]When a ship were found its equipment does not correspond substantially with the particulars of the Certificate by a nominated surveyor and corrective actions unable to be taken, then

the Certificate would be withdrawn

[单选题]In the absence of external forces，adding weight on one side of a floating vessel causes the vessel to ().

list until the center of buoyancy is aligned vertically with the center of gravity