公路水运工程试验检测活动应当遵循______的原则。
A．科学 B．客观C．全面 D．严谨E．公正
参考答案：A,B,D,E
Our teacher told us that _____.
A．Anna is going to have a party
B．he will be away for a few days
C．Sam wins first prize for his dancing
D．light goes much faster than sound
下列直放站采用的设备中，（）没有信号放大功能
A.直放站
B.有源天线
C.耦合器
D.干线放大器
