【单选题】Fire in an engine compartment is best extinguished with carbon dioxide gas(CO2)and by ______.
A.
completely closing the compartment
B.
closing the compartment except for the ventilators
C.
leaving the compartment open to the air
D.
increasing the air flow to the compartment by blowers
【单选题】CO2 extinguishes a fire by ____.
A.
a blanket of bubbles formed on the surface of the fire
D.
isolating the heat from the fuel
【多选题】H 2 和 O 2 在绝热钢管中反应生产成水,则下列状态函数中,增加为零的是( )
【单选题】The fire extinguishing action of CO2 comes mostly from _____.
A.
breaking the fire chemical chain reaction
D.
isolating the heat from the fuel
【单选题】郑 先生遵医嘱欲做中段尿细菌培养及药敏实验,护士对其做如下采集标本的指导,其中不妥的是:
【单选题】The fire extinguishing action of CO2 comes mostly from ____.
A.
isolating the heat from the fuel
D.
breaking the fire chemical chain reaction
【判断题】买卖双方在网络上相遇、交换商品、服务、信息,任何人或者企业都可以在网上开店,在线售卖产品或者服务,这种地方叫做电子市场。
【单选题】对电缆的主绝缘做耐压试验时,应该每一相单独进行。对一相进行试验或者测量时其余两相( )。