某气态烷烃与丙炔的混合气体22．4 L ( 标准状况 ) ，完全燃烧后生成121 g CO2 和40．5 g H2O，则原混合气体中烷烃的分子式为
| A．C3H8 | B．CH4 | C．C2H6 | D．C4H10 |
相关试题
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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