BBU-RRU的连接形式是:()
A.E1
B.T1
C.馈线
D.光纤
参考答案:C, D
It is none of your business _______ other people think about you.Believe yourself.
A.how
B.what
C.which
D.when
在火灾探测器的安装中,连接探测器的铜芯导线截面不小于( )mm2。
A.0.5
B.0.75
C.1
D.1.5