北朝末期，北周最终兼并了（）。 ["北魏","北齐","西魏","东魏"]
Which statement best describes the application of link fragmentation and interleaving （LFI）？（） ["It compresses the Layer 2 payload and marks the packet as a high priority to be transmitted first","It fragments larger packets and allows VoIP packets to be transmitted in between them.","It stops the transmission of large packets when priority packets arrive.","It sends high priority packets in between normal traffic packets."]
钢卷的内径垂直放置在地面上为（）。
山洪
明中叶以后，朝廷中以内阁为首的文官集团经常与皇帝争辩，甚至出现官员以因批评皇帝受到惩处为荣的现象。这主要表明当时（）。 ["君主专制进一步削弱","内阁职权凌驾六部之上","君权受到一定程度约束","文官集团以批评皇帝为乐"]
屋顶绿化的种植形式方式有（）、（）、盆栽、种植池栽和立体种植等。
