【单选题】
产品产量最优组合的条件是()
①
<imgwidth="112"height="74"src="http://wljy.whut.edu.cn:80/uploadfiles/word/QYJJF.files/QYJJF9297.png">
②
<imgwidth="112"height="74"src="http://wljy.whut.edu.cn:80/uploadfiles/word/QYJJF.files/QYJJF9400.png">
③
<imgwidth="105"height="74"src="http://wljy.whut.edu.cn:80/uploadfiles/word/QYJJF.files/QYJJF9503.png">
④
<imgwidth="107"height="74"src="http://wljy.whut.edu.cn:80/uploadfiles/word/QYJJF.files/QYJJF9606.png">