发布时间:2025-01-19 16:08:35
居民楼里平时不打开的电梯,应该是应急电梯或消防电梯,主要用于突发情况下的应急或逃生,所以平时是不打开的
一般情况下电源电阻小在测定电池的电动势和内阻的时候电流表为什么要内接
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