目前的TD-SCDMA系統(tǒng)采用的多址方式有（  ）
The multiple access modes adopted by the TD-SCDMA system include ( )
A.碼分多址
Code division multiple access
B.時(shí)分多址
Time division multiple access
C.空分多址
Space division multiple access
D.頻分多址
Frequency division multiple access