A、AB
B、A+B
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/52e70fec-1ad0-4ff0-9914-0df6a40669c9.jpg"title="ex_1426746709498_0.jpg" alt="ex_1426746709498_0.jpg"/>
D、<p><IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/4097e200-654b-4ed2-a4fd-01cc7450d229.jpg"title="ex_1426813331299_0.jpg" alt="ex_1426813331299_0.jpg"/></p>
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