在大气环境影响评价中,所说的逆温是指( )。
A.气温随纬度增加的现象
B.气温随高度增加的现象
C.气温随高度递减的现象
D.气温随纬度递减的现象
参考答案:B
电动调节阀可用于()。
A.调节热水流量
B.切断热水流量
C.调节蒸汽流量
D.切断蒸汽流
Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?()
A.Leaves a residue
B.Cost,relative to other agents
C.Breaks down while under prolonged storage
D.Conducts electricity