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问题 单项选择题

131I治疗后早发甲状腺功能减低是指（）

A.1年内发生的甲状腺功能减低

B.2年内发生的甲状腺功能减低

C.半年内发生的甲状腺功能减低

D.1个月内发生的甲状腺功能减低

E.1周内发生的甲状腺功能减低

答案

参考答案：A

填空题

用适当的介词或副词完成下列句子。 

1. There was nobody in the empty street ____ whom he could turn for help.

2. Mandela was generous ____ his time, ____ which I was very grateful.

3. We were put in a position ____ which we had either to accept we were less

    important or fight the government.

4. However, in 1963 I helped him blow ____ some government buildings.

5. The address ____ which all letters were sent was in South Africa.
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问答题

（1）假定两个分子的距离为无穷远时它们的分子势能为O，使一个分子固定，另一个分子在外力作用下从无穷远逐渐向它靠近，直至相距很近很近．两个分子间距离为r0时分子间的引力与斥力平衡，则当r＞r0时外力在做______（填“正功”或“负功”或“不做功）；当r＜r0时分子势能在______（填“不变”或“增加”或“减少”）

（2）地球上的海水的总质量达1.4×1021kg．如果把这些海水的温度减低10C，放出的热量就达9×1018KW•h，足够全世界使用4000年．这个设想不违背______，但是不能实现，所以叫______ 永动机，它违背了______．
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