单项选择题

What did Jason do when he was in high school and was down or upset?

A．He would find some really tough math or physics problems to do.
B．He would go to the dormitory and have a nice rest.
C．He would do both mentioned above.

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判断题

按照工作原理分类,泵与风机分为离心式、轴流式和容积式。正确错误

多项选择题

以下关于typedef的叙述的是()。

A、用typedef可以定义各种类型名,但不能用来定义变量
B、用typedef可以增加新类型
C、用typedef只是将已存在的类型用一个新的名字来代表
D、使用typedef便于程序的通用