下列有关水的叙述中,不正确的是( )
A.用明矾溶液可以区分硬水和软水
B.水是由水分子构成的一种氧化物
C.水汽化时分子间隔发生了变化
D.水是能溶解多种物质的常用溶剂
答案:A
以下哪项不是肌力评定分类()
A.器械分类
B.有无痉挛
C.肌肉收缩形式分类
D.评定部位分类
E.评定目的分类
Marginal revenue product is best defined as the:()
A. additional output that results from employing one more unit of a productive input.
B. gain in total revenue from selling one more unit of output.
C. addition to total revenue from selling the additional output from using one more unit of an input.