单项选择题

下列烯烃与HX加成的活性最快的是

A、2-丁烯
B、2-甲基-2-丁烯
C、3-氯丁烯
D、4-氯丁烯

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单项选择题

盐酸吸收塔的液位要求控制在0.2-1.5m之间，因为盐酸吸收塔渗漏，正常生产时吸收塔液位控制在（）

A.1m
B．0.7m
C．0.8m

Delivery (or delivery) process. This is the end operation of the distribution center, and also an important part of the whole distribution process. It includes ( ) two economic activities. A. Packaging and loading B. delivery and collection C. loading and delivery D. inventory and delivery

答案： C