用数字式万用表测电压值时，黑表笔插入（）。
A、V孔
B、A孔
C、COM孔
D、MA孔
参考答案：C
—Have you paid the rent of the house?
—The rent of the house? .
A．That isn’t due yet.
B．Are you sure?
C．The house needs repair.
D．Please remember the amount.
纯化水
A．脆碎度检查B．热原检查C．融变时限检查D．崩解时限检查E．黏度与稠度检查
