音机机芯的装配,要求磁头与磁带之间实现()运动。
A、恒速
B、随音频变化的
C、变速
D、加速
参考答案:A
— Has Tom already finished his new story?
一 I have no idea. He _____ it last month. [ ]
A. had written
B. was writing
C. would write
D. wrote
168.1.32/28网络, (48) 上是广播地址,可分配地址为 (49) 。
A.191.168.1.47 B.191.168.1.255 C.191.168.1.1 D.191.168.1.48