对全速率话音编码，信道编码比特的长度是（）bit
A.452
B.453
C.454
D.455
E.456
参考答案：E
After she finished the letter, she went to bed. [ ]
A. to write
B. writing
C. written
D. wrote
当亚洲低压强盛时：①印度半岛盛行西南季风②塔里木河断流③潘帕斯草原一片兴旺景象④旧金山进入少雨季节（）
A.①②③
B.②③④
C.②③
D.①④
