【单选题】【消耗次数：1】
直流电动机调速方法不包含（?? ?）。?
①
电枢回路串电阻
②
励磁回路串电阻
③
变频调速
④
调节电枢电压
参考答案：
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【多选题】
Among the outstanding inventions of modern times, television___________ must be included.
①
clearly
②
obviously
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definitely
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friendly
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Children are heavy television viewers who are strongly___________ by what they see.
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influence
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affected
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effect
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Department stores usually___________ customers with various kinds of goods.
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match
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service
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provide
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Thats beautiful, but___________ .
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its too bad
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its too expensive
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it costs too much
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the price is too high
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ideas
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suggestions
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information
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furniture