S1: How do you know the normal supply is available? S2: A white light on switchboard indicates that. Q: Which of the following is used to indicate a normally available supply?
单选题
What's troubling him? 他怎么了?
问答题
Talk about the maintenance of storage batteries. (蓄电池的维护) (1) Charge, discharge 充电、放电. (2) Remove connection oxides 除掉连接处氧化物. (3) Supplement distilled water 补充蒸馏水.
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