A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/5119472e-f0ac-4724-90f0-1e58f8b9364e.jpg"title="image17.jpg" alt="image17.jpg"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/baf5f801-bad3-4d38-8870-271d659fd1be.jpg"title="image18.jpg" alt="image18.jpg"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/14c9538a-c563-4014-b6b4-4be42aeec240.jpg"title="image19.jpg" alt="image19.jpg"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/9a718c3d-104a-4e36-a750-97df446fbbb7.jpg"title="image20.jpg" alt="image20.jpg"/>
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