Which of the following statements concerning the lubrication

【名词&注释】

传感器(sensor)、机动船(motor vessel)

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

A. Lubrication systems using engine driven lube oil pumps do not require any additionalindependent arrangement when such arrangements have been proven reliable.
B. The use of engine driven pre-lube pumps is permitted on vessels with propulsionsystems developing less than 500 shaft horsepower.
C. When forced lubrication is used for propulsion engines , one independently drivenstandby pumps is to be provided in addition to the necessary pumps for normaloperation.
D. Lubrication systems where two oil coolers are fitted require a minimum of twotemperature control devices which may be actuated by similar sensors.

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举一反三：

[单选题]听到警报信号后，船员必须在多长时间内到达指定的集合地点？

A. 1分钟
B. 2分钟
C. 5分钟
D. 6分钟

[单选题]根据刮油环的作用，刮油环的结构和安装有以下特点________。I．环与缸壁接触面积小II．环自身弹性大III．环天地间隙小IV．环工作表面多为矩形V．双刀环之间有泄油孔VI．安装时刮刀尖端向下

A. I+III+V
B. II+III+V+VI
C. I+II+III+V+VI
D. I+II+III+IV+V+VI

[单选题]决定两机动船是否构成对遇局面的航向是________。

A. 船首向
B. 磁航向
C. 罗航向
D. B、C是

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