A.钢                   B.铜                    C.石英砂                 D.铝

A.硅                                   B.铜

C.二氧化硅                          D.铝

光纤通信是以光作为信息的载体，让光在光导纤维中传播，制造光导纤维的基本原料是(     )

A．石墨                 B．铜                   C．石英               D．铝