以下关于经验概括的说法正确的是( )
A.属于在经验层次上对社会现象的反映 B.属于理论层次的概括C.其抽象和概括的程度较高 D.要求使用抽象的概念
参考答案:A
小明家装修房屋,用边长3分米的方砖480块正好铺满书房的地面.如果改用面积16平方分米的方砖,需要多少块?
Packet-switching wireless networks are preferable (41) when transmissions are (42) because of the way charges are (43) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (44) for the (45) of time they use the net-work.
A.point
B.start
C.length
D.end