题目内容

4．下列过程，是可逆的有：

A. 活塞无摩擦地缓慢压缩绝热容器中的理想气体
B. 缓慢旋转的叶片使绝热容器中的水温上升
C. 冰溶解为水
D. 一个受阻力的单摆的摆动。

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Britain is separated from the rest of Europe by the English Channel in the __ _ and the North Sea in the east.

A. east
B. south north

The Tories were the forerunners 0f __ _ , which still bears the nickname today.

A. the Labour Party
B. the Liberal Party
C. the Social Democratic Party
D. the Conservative Party

In Britain only _ __ of the population are farmers but they manage 7O% of the land area.

A. 2%
B. 3%
C. 4%
D. 5%

钢锭的凝固收缩包括（）、（）、（）