行气散结，止痛宜用（）。
A.橘皮
B.橘核
C.橘络
D.橘叶
E.化橘红
参考答案：B
Bread _____ grain. [ ]
A. is made of
B. are made of
C. is made from
D. are made from
矿尘按粉尘有无爆炸性划分为（）。
A.有爆炸性粉尘
B.无爆炸性粉尘
C.惰性粉尘
D.原生粉尘
E.次生粉尘
