Before an auxiliary boiler is shutdown for an extended period of time the water in the boiler should have a pH value of ().
时间:2020-05-11 02:26:56 关键词:for,shutdown,periodBefore an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of ().
A.10
B.7
C.4
D.1
答案解析
A
举一反三