正确答案: D

12/无限航区

题目：根据我国《海船船员发证规则》规定，持有沿海航区轮机部船员适任证书并实际担任其职务满______个月者，可跨航区申请______相同船舶等级和职务的适任证书。

解析：D

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举一反三的答案和解析：

[单选题]系统进行了一个过程后，如能使( )沿着与原过程相反的方向恢复初态，则这样的过程为可逆过程。

系统和外界

[单选题]Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with _______.

inadequate lubrication

[单选题]Each cylinder liner on the marine medium speed engines _____.

can be replaced when worn out

[单选题]The objectives of the ISM Code are to ensure ①safety at sea②prevention of human injury or loss of life③avoidance of damage to the marine environment and to property

①②③

[单选题]心绞痛病人舌下含服硝酸甘油______可以止痛。

1—2分钟内