氧气的相对分子质量是( )
A.8
B.16
C.32
D.32g
氧气的相对分子质量是16×2=32.
故选:C.
_____ any change about the date, please tell me immediately.
A.Will there be
B.Should there be
C.There will be
D.There should be
被认为世界上最早、实施最成功的新中国成立初期的健康促进策略是()
A.社会动员
B.健康促进
C.卫生宣传
D.爱国卫生运动
E.健康教育