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【单选题】
催化重整过程催化剂主要采用的贵金属是( )。
【单选题】
石油加工方法有( )、催化裂化、催化重整和加氢裂化。
【单选题】
催化重整的工艺流程主要有三个组成部分:预处理、催化重整( )。
【单选题】
苯烷基化生产乙苯过程中,催化剂红油中的( )是助催化剂。
【单选题】
在固体催化剂所含物质中,对反应具有催化活性的主要物质是( )。
【判断题】
. 催化剂的选择性是指催化剂促进主反应能力的大小。
【单选题】
催化重整过程主要包括的主反应有( )反应。
【单选题】
( )是催化重整装置生产芳烃的原料,也是生产乙烯的原料。
【单选题】
When he was asked about the missing briefcase, the man _____ever seeing it.
【单选题】
_____money, she is quite rich. However, this does not mean that she is happy.
【单选题】
_____the stress of examinations are over, we call all relax.
【单选题】
He was determined to sail around the world _____his illness and old age.
【单选题】
Although she wrote a lot of short stories and poems when she was very young, _____she was twenty five.
①
her first real success did not come until
②
her real first success came until not
③
since her first real success did not come until
④
not until her first real success
【单选题】
I was awfully tired when I got home from work, but a half hour nap _____me.
【单选题】
People’s status in society is frequently _____by now much they own.
【单选题】
_____ me most was that the young boy who had lost both arms in an accident could handle a pen with his feet.
【单选题】
Modern appliances _____us from a good deal of household work. For instance, the dryer frees us from hanging the laundry.
【单选题】
Mary has a _____ view of our future. But nobody believes what she said.