酸碱滴定中滴定终点时，溶液的PH值总是等于7。
参考答案：错
Suan , you are so lazy.This job ___ hours before.
A．should finish
B．could be finished
C．must have been finished
D．should have been finished
起重作业中，可以用大直径的钢丝绳凑合捆扎较小的构件，不可用小直径钢丝绳捆扎大物件进行吊装。（）
A、正确
B、错误
