下列气体中,不能用排空气法收集的是( )
A.H2
B.CO2
C.NO
D.O2
答案:C
一氧化氮气体遇空气,会迅速化合生成二氧化氮气体;
—You look beautiful your new dress and pink looks good you.
—Really? Thank you! [ ]
A. in; on
B. with; in
C. in; to
D. on; with
治疗胃火上炎的头痛、牙龈肿痛,宜选用的药组是
A.玄参黄芩
B.知母贝母
C.石膏升麻
D.龙胆黄柏
E.紫苏生姜