瓦斯治理的十二字方针是()。
A、监测监控
B、以风定产
C、先支后回
D、先抽后采
参考答案:A,B,D
Due to the unreasonable individual income _______, the gap between the rich and poor has become an outstanding issue.
A.contribution
B.association
C.accommodation
D.distribution
开挖工程测量中,断面图和地形图比例尺,可根据用途、工程部位范围大小在 ( )之间选择。
A.1:200~1:1000
B.1:500~1:2000
C.1:500~1:5000
D.1:1000~1:5000