A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1494124608342bed47c8c7674434f941ef6183f41f13cimage1.png">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/149412460842018c90e033f804940be46cfd7c5fe68f5image2.png">
C、45<sup>0 </sup>
D、φ