对于某些工程质量问题，可能涉及的技术领域比较广泛，或问题很复杂，有时仅根据合同规定难以决策，这时可提请专家论证。
参考答案：对
下列符合《中华人民共和国草原法》规定的有（）。
A、已造成石漠化的草原，应当限期治理
B、水土流失不严重的草原，实行有计划地开垦
C、有沙化趋势的已垦草原’应当有计划地退耕还草
D、需要改善生态环境的原，实行严格管理，合理开垦
A certain shade of gray paint is obtained by mixing 3 parts of white paint with 5 parts of black paint. If 2 gallons of the mixture is needed and the individual colors can be purchased only in one-gallon or half gallon cans, what is the least amount of paint, in gallons, that must be purchased in order to measure out the portions needed for the mixture ？（）
A.A
B.B
C.C
D.D
E.E
