A、I<sub>S</sub>e<sup>U</sup>
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1526006648027811b030813044b5e9c20ef6603012f19image1.png">
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15260066481110e7137acdf0a4e31816e35b59509d656image2.png">