（）会导致槽液浓度稀释，甚至会溢出槽外
A、直接蒸气加热
B、间接蒸气加热
C、电热管加热
D、槽外加热
参考答案：A
—Are the erasers in the box?
—No, ________. [ ]
A. it isn't
B. it is
C. they aren't
D. they are
哪些情况下需对蓄电池进行补充充电？
