The viscosity regulator controls the _____ of the fuel oil in order to provide the oil at
A. temperature
B. pumping rate
C. pressure
D. heat
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光泽与白肋烟内在质量有密切关系,表现为()。
A. 中下部以尚鲜明者质量好
B. 尚鲜明者香气浓、劲头大、杂气微有
C. 稍暗者香气浓、劲头大,杂气微有,吸味纯净
D. 光泽鲜明者,香气浓、劲头大,杂气微有,吸味纯净
核电厂的外围地带又称规划限制区,规划限制区边界以反应堆为中心半径不得小于()km。
A. 1.5
B. 3
C. 5
D. 10
在R、L、C串联电路中,当XL=XC时,比较电阻上UR和电路总电压U的大小为()
A. UR<u
B. ur=u
C. ur>U
D. UR=0,U≠0
If you wished to transmit a message by voice concerning the safety of navigation,you would
A. Mayday
B. Pan-pan
C. Securite
D. Safety