治外感温燥证,津伤较甚者,首选的方剂是()
A.桑杏汤
B.麦门冬汤
C.桑菊饮
D.清燥救肺汤
E.杏苏散
参考答案:D
This is a nattonal(国家的) flag(旗) of China. _________ it. It’s red and yellow.[ ]
A. Look
B. Look at
C. look like
D. look upon
常用的混凝土掺合料有什么?