轮机英语单项选择题每日一练(2019.09.20)

单项选择题
External and internal leakage in hydraulic systems may be caused by （）.
A.unusual vibration
B.excessive worn parts
C.abnormal pressure
D.any of the above
单项选择题
The ISM Code is a part of （）
A.SOLAS
B.MARPOL
C.STCW
D.Ballast Water convention
单项选择题
Which of the following statements describes the relationship between viscosity and specific gravity?（）
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other
单项选择题
Usually the panels are interlocked with （） so that the devices can be made dead before the doors are opened.
A.protective earth
B.isolators
C.ground switch
D.circuit-breakers
单项选择题
In a simple mechanical governor, the （）.
A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod