问题
单项选择题
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
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
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
参考答案：C