In battery charging rooms，ventilation should be provided（）.<br>A:at the lowest point<br>B:near the batteries<br>C:at the highest point<br>D:only when charging is in progress

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

出自：海船船员证

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