天花粉的归经是
A．肺、心经B．心、肝经C．肝、胃经D．肺、胃经
参考答案：D
解析： 天花粉归肺胃经，具有清热泻火，生津止渴，消肿排脓之功。
— Did they carry out the experiment in the school lab?
— No, it was in the scientific center _______ their teacher worked. [ ]
A. that
B. where
C. why
D. when
通过蜗杆轴线并垂直蜗轮轴线的平面称为（）。
