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【判断题】
在直动从动件凸轮机构中，无论选取何种运动规律，从动件回程加速度均为负值。
A.
正确
B.
错误
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【单选题】Do you like business English?
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Yes, I do.
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Sarah, who likes reading and writing.
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【单选题】已知某种介质对真空的临界角是α 0 ，真空中的光速是c，那么光在这种介质中的速度是    (    )
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B.
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【简答题】已知铁在介质中的腐蚀电流密度为 0.5mA/cm3, 求其腐蚀速率 V ω和 Vd 。请判断铁在此介质中是否耐腐蚀。
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【简答题】阅读理解。 How do you pay for things? Do you usually use cash (现金), or do you like to pay by credit card (信用卡)? If you are like a lot of people, you probably have at least one credit card. Also, you might ...
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【单选题】已知溴在酸性介质中的电势图为 则下列说法不正确的是 ( ) A. 酸性介质中,溴元素中间价态的物质均易发生歧化 B. 酸性介质中, HBrO 能发生歧化 C. 酸性介质中, BrO 4 - 能将 Br - 氧化为 BrO 3 - D. 酸性介质中,溴的含氧酸根都具有较强的氧化性
A.
B.
C.
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相关题目：
【单选题】Do you like business English?
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【简答题】已知铁在介质中的腐蚀电流密度为 0.5mA/cm3, 求其腐蚀速率 V ω和 Vd 。请判断铁在此介质中是否耐腐蚀。
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【单选题】已知溴在酸性介质中的电势图为 则下列说法不正确的是 ( ) A. 酸性介质中,溴元素中间价态的物质均易发生歧化 B. 酸性介质中, HBrO 能发生歧化 C. 酸性介质中, BrO 4 - 能将 Br - 氧化为 BrO 3 - D. 酸性介质中,溴的含氧酸根都具有较强的氧化性
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