碳酸钠溶液不能直接排入下水系统，需用容器收集起来，加（）中和或加入（）稀释。
参考答案：酸；大量水
The old man ____ for three years. [ ]
A. has died
B. has been died
C. has been dead
病人卧时向外，躁动不安属( )
A．寒证
B．阳证
C．虚寒证
D．阴证
E．虚证
