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【简答题】
电压互感器一次绕组及二次绕组的接地各有何作用？接地方式有何差异？
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【简答题】I was told that there were about 50 foreign students _____ Chinese in the school, most _____ were from Germany. A.study of whom B.study of them C.studying of them D.studying of whom
【简答题】下图表示的是地壳里所含各种元素的质量分数。请根据该图回答下列问题： (1)地壳中硅元素的含量为 。 (2)地壳中含量最多的非金属元素与含量占第一位的金属元素之间， 形成化合物的化学式可以是
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【单选题】When I was young, I was told that I ______ play with matches
A.
wouldn't
B.
needn't
C.
mustn't
D.
daren't
【判断题】对于已设计成功消除球差的光学系统,在装配完后经检验存在较大的球差,造成此球差存在的主要因素是系统各个元件之间的间距不符合设计要求(包含系统本身厚度的加工误差)。
A.
正确
B.
错误
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