下列敘述中正確的是（ ）
Which of the following statements are correct?
A.在TD-SCDMA系統(tǒng)中每20MS為一個(gè)無線幀
In the TD-SCDMA system, every 20ms forms a radio frame
B.在TD-SCDMA系統(tǒng)中每10MS為一個(gè)無線幀
In the TD-SCDMA system, every 10ms forms a radio frame
C.每個(gè)無線幀可以分成2個(gè)子幀
Each radio frame is divided into 2 subframes
D.每個(gè)無線幀可以分成4個(gè)子幀
Each radio frame is divided into 4 subframes
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