_______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
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
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