添上“+”号和括号,括到括号里的各项都 ;
添上“-”号和括号,括到括号里的各项都 ;
不变号 ; 改变符号
In the supermarket foreign names of the products got _______, and I was confused about what to buy.
A.mixed up
B.fixed up
C.picked up
D.showed up
在建筑物外围10m处绕建筑物一周做室内覆盖信号泄漏电平测试(锁频测试),要求泄漏电平应低于()dBm。
A、-75
B、-85
C、-90
D、-95