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SECTION A COMPOSITION (35 MIN) Some say it is human nature to want something new and something different. Comment on this. Write on ANSWER SHEET TWO a composition of about 200 words on the following topic: STRIVING FOR SOMETHING NEW AND SOMETHING DIFFERENT You are to write in three paragraphs. In the first paragraph, state your point of view. In the second paragraph, give one or two reasons to support your point of view. In the last paragraph, bring what you have written to a natural conclusion. Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the instructions may result in a loss of marks.
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【简答题】今测得一标准直齿圆柱齿轮（正常齿）的齿顶圆直径d a 为130mm，该齿轮的齿数z为24，正常齿齿顶高系数h a * ＝1.0，求该齿轮的模数m。
【简答题】以原子吸收光谱法分析尿样中的 Cu 含量,分析线为 324.8nm ,测得数据如下表所示,计算样品中的 Cu 的质量浓度( μg·mL -1 )? 加入 Cu 的质量浓度( μg/mL ) 吸光度 0 (试样) 0.28 2.0 0.44 4.0 0.60 6.0 0.757 8.0 0.912
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