一块正方形地的面积是900平方米，把它画在地图上的面积是16平方厘米，这幅地图比例尺是（ ）。
1∶750
表明熵变的下列反应，正确的是（）。
A.
B.
C.
D.
A local area network (LAN) is the communication of a number of computers by connecting to each one in a single location, usually a single floor of a building or all the computers in a small company. A. lineB. cable C. copper D. copper cash
