某测区面积约1平方公里(约1000m×1000m)测图比例1:500,图幅为50cm×50cm,该区测图分幅应是()幅。
A.4
B.8
C.12
D.16
参考答案:D
Customs and transport authorities should the sales channel of fake notes by carrying on more checks on ports and waterways, it said.
A.cut down
B.cut up
C.cut off
D.cut away
污染预防的具体做法可分几个层次?分别是什么?