单项选择题

设备及管道绝热结构设计的一般要求中，当设备及管道外表面温度高于（）℃时，需要设置保温绝热层，绝热层厚度按相关规定计算确定。

A.40
B.50
C.60
D.70

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单项选择题

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B.细辛
C.厚朴
D.党参
E.斑蝥

单项选择题

W: Where can I get a color TV set at a reduced price?M: You can order it through your school.W: Is the price good enough?M: Last month I got one at a half regular price.What does the man mean?（）

A．The school TV sets are unreliable.
B．The school will probably offer a good price on TV sets.
C．Color TV sets are very cheap at market.
D．It is better to order a color TV set through computer.