容器苗管理喷水过多则()。
A.侧根很少
B.几乎不生侧根
C.侧根数过多
D.生2~3条侧根
参考答案:B
The Smiths have been married, but have no children of his own.
从100毫升20%的食盐溶液中取出10毫升,这10毫升溶液的溶质质量分数为( )
A.20%
B.10%
C.30%
D.80%