不定项选择
电磁干扰按传播途径可以分成传导干扰和辐射干扰两类。
A.错误
B.正确
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单项选择题
In the US, the parents would educate their kids by using the following methods: learning bicycle repair rather than taking a bike to a mechanic's shop; sewing clothing rather than buying new clothes and saving recyclable materials.________
A.对
B.错
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单项选择题
称量10毫升溶液使用( )毫升的量筒比较合适。 A. 100 B. 50 C. 20 D. 5
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