A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15901184503047d9fbe20ee1e42689e2c89ef9f47c66fimage1.png"style="width:104px;height:48px;"/>
B、 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1590118450394af284f5cfad84e199f409b3b841f449bimage2.png"style="width:104px;height:49px;"/>
C、 <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15901184504477af8dcb2110d40f482d20ab6d6269c7eimage3.png"style="width:92px;height:49px;"/>
D、Au=1