______ she is ill, ______ she goes to school. [ ]

A. Although; /

B. Although; but

C. But; although

D. Because; /

对于注射成型，慢速充模时，塑料内高分子定向程度大，塑料性能各向异性显著。高速充模时，高分子定向程度小，塑件熔接强度高，充模速度以（）为宜。

A、慢速充模

B、高速充模

C、速度不宜过高