有a L乙炔和乙烯的混合气体，在催化剂作用下与足量的H2发生加成反应，消耗H2 1.25a L，则乙烯与乙炔的体积比为( )
| A．1∶1 | B．2∶1 | C．3∶1 | D．4∶1 |
相关试题
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
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