小于2m跨度的悬臂板拆除底模,应在混凝土强度达到设计强度的()时方可拆除。
A.40%;
B.50%;
C.70%;
D.100%。
参考答案:C
下面哪些行为不与控制信道相关()
A.DTX
B.加密
C.跳频
D.GMSK
The radio set __ _ last week has been out of order.
A.I bought
B.I bought it
C.which I bought it
D.what I bought