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问题 选择题

下列各种情况下比热容会发生变化的是（　　）

A．一杯水倒去一半

B．水凝结成冰

C．一块铁加工成铁屑

D．15℃的水变成45℃的水

答案

物质的比热容是物质本身的一种特性，与质量、温度、形状无关．水凝结成冰，变成了另一种物质．

故选B．

问答题

In 2008, the recession hit the main markets to which Xejn Limited exported its products, namely South Asia. As a result, orders were reduced dramatically. The company had a workforce of over 300 people. Management introduced a four day week but even this measure did not significantly improve the company’s financial position. The management of Xejn Limited had no alternative but to reduce the workforce of the local plant by 50% in order to improve its financial stability and ensure that the company did not close down.Required:

(a) Explain whether the management of Xejn Limited can terminate the employment of half its workforce on the grounds of redundancy. (4 marks)
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填空题

由分子构成的物质，在发生状态变化时，构成物质本身的分子______（填改变或不改变），改变的是______．
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