A.甲吸引丁,乙排斥丁
B.甲排斥丁,乙吸引丁
C.甲、乙都吸引丁
D.甲、乙都排斥丁
答案:A
Generally,the first action in extinguishing an LFG fire caused by escaping gas is to().
A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department
精馏操作中,若F、xF、q、R在不为的条件下,将塔顶产品量D增加,其结果是()
A.xD下降,xW上升
B.xD下降,xW不变
C.xD下降,xW也下降
D.无法判断