()存内,邪不可干;()之所凑,其气必虚。
参考答案:正气;邪
There are some pictures_____ the wall and some windows _____ the wall, too. [ ]
A. on; on
B. on; in
C. in; on
既能用浓硫酸干燥,又能用固体氢氧化钠干燥的一组气体是( )
A.H2 O2
B.H2 NH3
C.CO2 HCl
D.CO CO2