两器同高并列式催化裂化装置，只能采用固定床反应器。
A. 正确
B. 错误
Theoretical perfect combustion in a diesel engine yields by-products of （）.
A. aldehydes and carbon dioxide
B. water vapor and carbon monoxide
C. nitrogen and carbon monoxide
D. water vapor and carbon dioxide
When two vessels are in immediate danger of collision，the stand-on vessel must（）.
A. abandon ship
B. assist in taking whatever action is necessary to avoid collision
C. hold course and speed
D. sound a distress signal
A320飞机的登机音乐系统提供3个节目选择，由前乘务员面板控制播放。
A. 正确
B. 错误
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