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What is Devorah Day going to sing in future?

What is Devorah Day going to sing in future? A.Continue to sing jazz. B.Transfer

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听录音,回答题 What crops does the farmer grow?

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工业上制造金刚砂(SiC)的化学方程式为在此反应中还原剂和氧化剂的物质的量之比为(  )

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理想变压器原、副线圈的匝数比为4:1,原线圈接在μ=311sinl00πt(V)的交流电源上,副线圈所接的负载电阻是ll

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