正确答案: B

两段/6小时

题目：《海船船员值班规则》规定，值班船员每天的休息时间可以分开，但不超过______时间，其中一段时间至少要有______。

解析：B

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举一反三的答案和解析：

[单选题]Fusible plugs are installed in fire-tube boilers to _____.

warn the engineer of low water level

[单选题]消化系统由______组成。

消化管和消化腺

[单选题]Which of the following statements concerning the lubrication of diesel propulsionengines used in vessels over 300 gross tons is most accurate? ( )

When forced lubrication is used for propulsion engines , one independently drivenstandby pumps is to be provided in addition to the necessary pumps for normaloperation.

解析：解析：gross:总的，毛的;accurate：精确的;additional:附加的;independent：独立;arrangement：布置，安排;reliable：可靠的;device：设备;actuate：开动;similar：类似的;sensor：传感器

[单选题]消防员装备包括1套个人设备和1副_______。

呼吸器

[单选题]如果承运人或其代理人在提单上批注了“( )”字样，该提单就成为不清洁提单。

五件短缺，争议中

[单选题]体温的正常值，腋温()

36.0-37.0℃