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指图纸的尺寸大小，以幅面代号A0、A1、A2 、A3 、A4 区分。

【参考答案】

图纸的尺寸大小通常按照国际标准ISO 216来规定，该标准定义了A系列纸张的尺寸。A系列纸张的尺寸是基于一个固定的面积和......

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Section C Directions: Read the following text about the Marathon. Five sentences have been removed from the text. Choose the best sentence from the list A-F on the next page to fill in each of the gaps (36-40). There is one extra sentence which you do not need to use. Running the Marathon – Health Risks Running a marathon is the ultimate goal for a hobby athlete. But there can be dangers involved in running a 26.2 mile or 41.2 km race. Most health problems that happen during a marathon race are not very severe – mainly strains and sprains. In some cases, however, heart problems have led to deaths during or immediately after a marathon. In the United States researchers found out that of 11 million runners who have taken part in marathons or half marathons in the last decade 42 died. (36)_______________. Many health experts advise beginners to see doctors before they take up training for a race. (37)_______________. Many hobby athletes do not prepare themselves in the right way for a race. Getting yourself in good physical shape over a period of months is not always easy and requires a lot of self-discipline. Training must start slowly, with short distances, so that your body can get used to the physical stress. (38)_______________. Rest periods should follow days of training. Running advisors say that about a month before a marathon you should be able to run 15 miles, or almost three quarters of the marathon distance, at a comfortable speed. Training too much, however, can lead to stiffness in your muscles or other injuries. (39)_______________. Shortly before a marathon starts, warming up and stretching can be important for your overall performance. One of the biggest problems that marathon runners face during a race is dehydration（脱水）, not getting enough to drink. (40)_______________. One of the most important tasks for a runner is to drink enough throughout a race. A. If it’s hot your body can lose about four liters of fluid through sweating and breathing out air. B. To relieve them, you should lower your training rate and take a few days off. C. Runners often make the mistake of running too fast at the beginning. D. People with heart problems or diabetes should also consult doctors before running. E. Runners should get themselves professional coaches to perform better in a race. F. Most of them had heart problems or heart-related diseases. 请填入正确答案相应的大写字母！ 36. __________

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简述基于等位基因特异性寡核苷酸杂交反应的SNP检测芯片原理。

单项选择题

教学案例“从微粒观的角度看溶液”指出看溶液应该具有哪些角度

A、微粒的种类
B、微粒的数量
C、微粒间的相互作用
D、微粒间作用的结果

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