循环水系统管线水冲洗一般使用()。
A、脱盐水
B、消防水
C、新鲜水
D、循环水
参考答案:D
In the survey they listed twelve kinds of food _______would affect the work of the brain.
A.which the experts believed
B.that were believed
C.the experts believed that
D.the experts believed
Zeta电位降低产生:
A.分层B.转相C.酸败D.絮凝E.破裂