题目内容
保护装置的电源由变电所的直流系统或交流保安电源系统供给。
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当变压器的额定电压在500V以下时，选用 500V的兆欧表。
Chinese Jiu(酒)is wine in English.
You can propose a toast to many people at a time when drinking if you are the person who is paying.
It is always appropriate to bring a bottle of wine and expect your wine to be opened that evening when you are invited to one's home for dinner.
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