A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/f4f6027e-3217-404a-ba90-588c11c255a6.jpg"title="ex_1256971262460_0.jpg" alt="ex_1256971262460_0.jpg"/>
B、等产量曲线和等成本线相切
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/0f811302-c083-498b-a850-e06307eed490.jpg"title="ex_1256971299157_0.jpg" alt="ex_1256971299157_0.jpg"/>
D、上述说法都对
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