小同轴电缆同轴对的特性阻抗一般标准定为()Ω。
A.75
B.150
C.600
D.800
参考答案:A
To our great________, his parents were________at his mark. [ ]
A. surprises; surprised
B. surprises; surprising
C. surprise; surprised
D. surprise; surprising
两手对拉一弹簧秤,它的示数是10 N,这两手的拉力分别为( )
A.5 N,5 N
B.10 N,10 N
C.0 N,0 N
D.20 N,20 N