GE的光模块在传输距离上有()几种
A、10km
B、20km
C、40km
D、80km
参考答案:A, C, D
Had it not been for the fact that she was_________ with her work, she would have attended the concert
A.occupied
B.absorbed
C.devoted
D.concentrated
106涂料是指()。
A.聚乙烯醇水玻璃涂料
B.聚乙烯醇缩甲醛涂料
C.聚醋酸乙烯涂料
D.氯化橡胶涂料