氯气冷却设备钛冷却器属于（）。
A、板式换热设备
B、列管式换热设备
C、螺旋板式换热设备
参考答案：B
It has been proved________violence on television has a bad effect on the development of children.[ ]
A．whether
B．because
C．when
D．that
______或______法，能开肺气，举中气，而通下焦之气，是一种简单而有效的通利小便的方法。
