设置机械排风装置的气体灭火系统防护区,排风扇宜如何设置?
A. 设置在防护区下部,并应直通室外。
B. 设置在防护区上部,并应直通室外。
C. 设置在防护区下部,并应通向无人场所。
D. 设置在防护区上部,并应通向无人场所。
The percentage of the total surface area or volume of a flooded compartment that can be occupied by water caused by damage is known as ().
A. one compartment standard
B. center of flotation
C. permeability
D. form. gain
功率在1kV以上的直流电机作耐压试验时,成品试验电压为()V。
A. 2UN+100
B. 2UN+500
C. 1000
D. 500
入汤剂应当先煎的药物
A. 甘草
B. 阿胶
C. 旋覆花
D. 番泻叶
E. 石决明