题目内容

高压控制设备装有短路、过负荷、接地和欠压释放保护。()

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—Write a memo of words to your boss to include:
—a request to go on the course
—some details about the course(e, g. date, cost)
—why you think the course wilt be useful.
—Write 40-50 words on a separate sheet.

井上下对照图每季度填绘1次,图面表达和注记无矛盾。()

过采空区、老巷、断层、破碎带和岩性突变地带等应有针对性措施。()

新标准规定瓦斯抽采管路离地面高度应不小于0.3 m。()

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