《中华人民共和国水法》规定,国家对用水实行总量控制和( )相结合的制度。
A.定额管理
B.阶梯水价
C.定价机制
D.配额管理
参考答案:A
________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A.Even if
B.As far as
C.If only
D.So long as
包装上有“无菌”、“无热原”的字样()
A.医用纱布
B.医用橡皮膏
C.创可贴
D.一次性使用输液器
E.医用绷带