单项选择题
A.反射B.折射C.干涉D.衍射
A.爱根核B.小粒子C.中粒子D.大粒子E.巨粒子
A.30sB.60sC.120sD.180s
A.192.168.0.0/22B.192.168.124.0/22C.192.168.120.0/22D.192.168.120.0/21
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