问题
单项选择题
On a class “B” fire，which portable fire extinguisher would be the LEAST desirable?（）
A.Carbon dioxide
B.Water (stored pressure)
C.Dry chemical
D.Foam
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
On a class “B” fire，which portable fire extinguisher would be the LEAST desirable?（）
A.Carbon dioxide
B.Water (stored pressure)
C.Dry chemical
D.Foam
参考答案：B
H++OH-，在不同温度下其平衡常数为Kw(25 ℃)=1．0×10-14，Kw(35 ℃)=2．1×10-14。则下列叙述正确的是