_______can cause oil flow from water outlet of the oil purifier.
A. Oil inlet valve opening too quickly
B. Oil temperature little higher than normal
C. Diameter of gravity disc too small
D. Viscosity of oil little lower than normal
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随着价格水平相对成本上升，同时实际工资率下降，利润________，同时企业的数量会________。
A. 增加；增加
B. 增加；减少
C. 减少；增加
D. 减少；减少
E. 不变；不变
As a duty engineer, as soon as your hear the fire emergency signal, you should ensure that
A. ring buoys are thrown overboard
B. engines are stopped
C. fire pumps are started
D. life preservers have been issued to everyone
When the tail-shaft is drawn from a vessel in dry-dock, which of the following inspections
A. The propeller hub taper and shaft keyway should be inspected for cracks or corrosion
B. The stern bearing alignment with the stern frame should be checked
C. The interior of the stern tube should be inspected for leaks
D. The shaft liner should be removed and inspected for cracks
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