【单选题】【消耗次数:1】
For programs with_________ audiences, the cost of commercials is high.
few
more
small
large
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相关题目
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【单选题】 若变压器的一次绕组匝数减少而电压幅值不变,变压器的励磁电流将( )。
①  升高
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【单选题】 他励直流电动机( ),不适合频繁起动的大、中型电动机
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