反渗透的压力容器材质是()。
参考答案:玻璃钢
If you want to be thinner and healthier, you'd better eat _____food and take
_____exercise.[ ]
A. more; fewer
B. more; less
C. fewer; more
D. less; more
逆流再生除盐设备大反洗后,再生时,再生剂用量要比通常再生多()倍。
A.1;
B.2;
C.0
D.3。