现有4.6g某有机物在空气中完全燃烧,生成了8.8gCO2和5.4g水,该有机物可能是[ ]
A.CH4
B.C2H4
C.C2H6
D.C2H5OH
答案:B
— Nowadays few people live in a place permanently, and population mobility is a ______.
— Yes. The present world is more on the _______ than ever before. [ ]
A. tendency; go
B. trend; move
C. phenomenon; move
D. fashion; go
具有防治矽肺作用的祛风湿药是()
A.秦艽
B.防己
C.雷公藤
D.番泻叶
E.苦参