能有效去除水中硅化合物的是()。
A.强酸阳树脂;
B.弱碱阴树脂;
C.强碱阴树脂;
D.弱酸阳树脂。
参考答案:C
“水晶之夜”
In battery charging rooms,ventilation should be provided().
A.at the lowest point
B.near the batteries
C.at the highest point
D.only when charging is in progress