①将无色气体充分燃烧;
②燃烧后生成的气体通过浓硫酸的装置,装置的质量增加7.2g;
③再将剩余气体通过盛氢氧化钠溶液的装置,装置的质量增加8.8g.
下列推断错误的是( )
A:原无色气体中可能只含有CH4和H2
B:原无色气体中可能只含有CH4
C:原无色气体中可能只含有CO和H2
D:原无色气体中一定含有碳元素、氢元素
下列运算正确的是( )
him sleep quick hurt smell
①Do you know why Jenny ran ____ out of the room?
②The baby is too young to look after____.
③I got up too early and I'm feeling very ____ now.
④My brother ____ his leg when he fell off the bike.
⑤This flower sends out one kind sweet ____.