PDH微波一般采用A复接方式，SDH微波一般采用（）复接方式。
A、按位，按字
B、按字，按位
C、按位，按帧
D、按字，按包
参考答案：A
Now that she is out of work, Lucy going back to school, but she hasn't decided yet. [ ]
A. had considered
B. considered
C. has been considering
D. is going to consider
美国和欧洲的研究人员6月15日在美国加利福尼亚州圣迭戈宣布，他们“非常清晰”地再次探测到“时空涟漪”——（）的存在。
A.量子波
B.电磁波
C.虫洞
D.引力波
