测定葡萄糖含量采用旋光法，向待测液中加氨水是为了( )
A、中和酸性杂质D
暂无解析
4岁以上的儿童化脓性脑膜炎最常见的病原菌是（）
The professor worked for 7 hours at a ________.
It _______ me three years to draw the beautiful horses.
It is no use arguing _______ the plan because it has been rejected.
Americans eat ______ vegetables per person today as they did in 1910.
