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【填空题】
open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, Experts say our company is amazing in that sales have been increasing steadily [ ]
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答案
over time
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直流电机在正常使用过程中,温度升高会使电刷接触压降减小,可能引起换向不良。
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B. 错
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在直流电动机中,电刷两端加的是直流电。’
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在直流电动机中因电刷和换向器的作用,线圈内部为交流电。
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B. 错
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