题目内容

电机运转时轴承温度过高,主要原因是()

A. 润滑脂牌号不合适
B. 润滑酯质量不好或变质
C. 轴承室中润滑脂过多或过少
D. 润滑脂中夹有杂质

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依据环境要素的不同,我们可以将环境分为()。

A. 大气环境
B. 水环境(湖泊环境和河流环境)
C. 海洋环境
D. 土壤环境
E. 生物环境(森林环境、草原环境)

Ben Franklin was versatile in every possible field and he was chiefly noted as a man of civic mind. ()

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In 1836, Whitman published his first book, Nature, which met with a wild reception.()

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