下图表示2A(g)+B(g)2C(g)(正反应放热)。这个可逆反应的正确图像为[ ]
A.
B.
C.
D.
答案:A
下列实验装置的设计、试剂选用或操作正确的是( )
除去NO中混有的NO2
铁制品表面镀锌
稀释浓硫酸
制备少量O2
22. This book ________ 20 articles, ________ three written by his daughter.
A.contains, includes
B.includes, containing
C.contains, including
D.includes, contained