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【单选题】
乙苯催化脱氢生产苯乙烯是一个气固相反应，适宜选用下列反应器：A.
釜式反应器
B.
塔式反应器
C.
流化床反应器
D.
绝热式固定床反应器
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反馈参考答案：
举一反三
【简答题】CFR贸易术语中( )负责办理保险
【单选题】Each type of engine has its applications, which on board ship have resulted in the slow-speed main propulsion diesel operating ______cycle.
A.
on four-stroke
B.
both on two-stroke and on four-stroke
C.
on two-stroke
D.
either on two-stroke or on four-stroke
【单选题】Each type of engine has its applications which on board ship have resulted in the slow speed main propulsion diesel operating _____cycle.
A.
on the four-stroke
B.
in the two-stroke
C.
on the two-stroke
D.
either on the two-stroke or on the four-stroke
【简答题】简述环境容量和环境承载力的定义。
【简答题】若目的产物为多组分,收集时可采用()分步收集。
【单选题】Each type of engine has its applications, which on board ships have resulted in the slow speed main propulsion diesel operating _______ cycle.
A.
On the four-stroke
B.
in the two-stroke
C.
on the two-stroke
D.
either on the two-stroke or on the four-stroke
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