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【简答题】
低压电器通常指工作在交流电压()、直流电压()以下的电器。 2.电磁式电器的电磁机构由()、铁心和()组成。 3.短路环的作用是消除()和(),保证电磁机构可靠的工作。 4.接触器与继电器相比,触点流过的电流(),()灭弧装置。 5.对于通电延时时间继电器的触点,线圈通电后触点()闭合,触点闭合后断开线圈电源,触点会()断开。
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【单选题】________you have learned to respect others, you will find it easy to be respected.
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Although
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Once
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Before
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When
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what you have learned
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how what you have learned
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that what you have learned
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how that you have learned
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