A:100mL H2和50mL O2
B:100mL HCl和100mL NH3
C:100mL NO和100mL O2
D:100mL N2和200mL O2
—Sorry, she isn't at home at the moment. _______?
核糖与核酸都不含有的元素是( )
____,不问苍生问鬼神。