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注:所有计算中一律取g=10N/kg一、在下列每个题目中选出一个符合题意的答案,把答案前的字母代号填在题后的括号内(每小题2分,共20分)1.把一根长为20m,直径为5mm的粗铜线,用拉丝机拉成直径为1mm的均匀细铜线后铜丝的长度是:()A.12500m。B.2500m。C.500m。D.100m。2.一船往返于甲
Note: In all calculations, take g=10N/kg. 1. Select an answer that matches the question in each of the following questions. Put the letter code before the answer in the parentheses after the question (2 points for each question, total 20 points) 1. The length of a thick copper wire with a length of 20m and a diameter of 5mm is drawn to a uniform fine copper wire with a diameter of 1mm by a wire drawing machine. The length of the copper wire is: () A.12500m. B.2500m. C.500m. D.100m. 2. A ship to and from A