直角三角形的两锐角平分线所交成的角的度数是[ ]
A.45°
B.135°
C.45°或135°
D.以上答案均不对
答案：C
Having retired from business, she now ______ herself with the rights of women and welfare of the disabled.
A．associated
B．occupied
C．charged
D．rewards
适用于游泳池、公路及机场跑道的是哪种补缝、接缝材料（）
A. 聚硅氧烷密封膏
B.沥青嵌缝油膏
C. 聚氨酯密封膏
D.丙烯酸类密封膏
