下列物理信道中哪些属于LTE上行物理信道包括（）
A.PUCCH
B.PRACH
C.PUSCH
D.PBCH
参考答案：A, B, C
The word “invade” in Paragraph 4 is closet in meaning to______.
A.Come in without permission.
B.Enter with invitation.
C.Visit in large numbers.
D.Appear all of a sudden.
用一个动滑轮匀速度提升某重物的过程中，有用功为80焦，总功为100焦，则这个动滑轮的机械效率是______．
