【单选题】【消耗次数：1】
系统的传递函数，则系统的增益为（）
①
0.5
②
5
③
3
④
0.3
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已知系统的开环传递函数为<imgwidth="92"height="44"src="http://wljy.whut.edu.cn//uploadfiles/word/zdkzll002.files/image022.png">，则该系统的开环增益为（）。
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