不定项选择

尖顶型反应是优化条件范围较宽的反应，即使某个工艺参数稍稍偏离最佳条件，收率和质量也不会受到太大的影响

A．正确
B．错误

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单项选择题

Whichof the following is TRUE according to the lecture?
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B、Amazonhas set the precedent of today’s retail buying experience.
C、JDWorldwide has become the number one online marketplace for global anddomestic China trade.
D、Beginningwith selling solely books, Alibaba has developed into the world'slargest e-commerce company.

单项选择题

检查中出现的问题由2号乘务员统一与机务协调。
A、正确
B、错误