某气体的质量是9.5g,体积是5.6升(标准状况下),该气体的摩尔质量是( )
A.38
B.38g•mol-1
C.19
D.19g•mol-1
答案:B
---Did you go somewhere on holiday?
---I ____________ to go to Hawaii, but I didn’t sign up for the tour in time.
A.would hope
B.was hoped
C.had hoped
D.have hoped
过滤器压差大于()时应进行冲洗。
A、0.01MP
B、0.05MP
C、0.10MP