城市中许多家庭使用的罐装“煤气”，实际上是液化石油气，以下有关液化石油气的叙述不正确的是（ ）
| A．液化气是一种混合物，其主要成分是丙烷、丁烷、丁烯 |
| B．液化气用完后，瓶内往往会残留一些液体，其成分是水 |
| C．液化气可用作燃料 |
| D．液化气是石油化工生产过程中的一种副产品 |
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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