多项选择题

造成短路的主要原因有哪些?()

A、线路老化
B、绝缘体破坏
C、人为的乱拉乱接
D、电源过电、造成绝缘击穿

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单项选择题

“It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair.” This is the beginning of ___________. A、David Copperfield B、Bleak House C、Great Expectations D、A Tale of Two Cities

不定项选择

不同的预测模型适应不同的物流预测对象。‎<b

A．正确
B．错误

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