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问题 选择题

保温瓶中装有大量0℃的水，然后放入少量－1℃的冰，盖好瓶塞，则

A．有少量冰熔化成水

B．有少量水凝固成冰

C．冰、水多少都不变

D．冰、水的温度都不变

答案

答案：B

题目分析：混合到一起后，由于存在温度差，0℃的水会有放热，所以会有少量的水凝固成冰，而－1℃的冰会从水中吸收热量，但到0℃后，温度一致，不能继续吸收热量，所以不会熔化。

故选B。

点评：熔化和凝固过程要继续吸热和放热是解题的关键，

单项选择题

An Enterprise Resource Planning (ERP) is built upon a commercial（）that promises the seamless （）of all the information flowing through the company ─financial, accounting, human resources, supply chain and customer information. In implementation, all ERP systems include several features. The system is installed on a typical database management system. It requires initial setup according to the organization’s process, but it may be（）according to the organization’s unique process requirements through a tool set contained within the ERP applications. Using ERP,（）can be prescribed to automate approval processes through established chains of command. One of the methods used to effect rapid implementation of the ERP system is to conduct concurrent（）sessions during the early stages of ERP implementation.

that promises the seamless（）of all the information flowing through the company ─financial.

A．association

B．connection

C．combination

D．integration
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单项选择题

城镇居民一般上班族家庭早餐是（）。

A、少而丰

B、正而丰

C、饱即宜

D、少而精
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