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一、填空题 1.在0℃和标准大气压下,汽车平均排放1厘米~3的污染气体含有2.7×10~(13)个分子。若北京市按1000万人口计,如果这1厘米~3的污染气体全被每个北京人吸入体内,则平均每人吸收被污染的气体分子数为____个。 2.人在青年时期的头发强度最大,如20岁组的人能承受的拉力平均为1.72牛,如果把该强度当作1,则40岁人的头发强度数为0.8,那么40岁组人的头发承受最大拉力为____牛。 二、选择题(其中第3～7题为单选;第8、9题为多选)
First, fill in the blank 1. At 0 °C and standard atmospheric pressure, the car’s average emission of 1 cm ~ 3 of pollution gas contains 2.7 × 10 ~ 13 molecules. If Beijing counts 10 million people, if the 1 cm~3 pollution gas is inhaled by every Beijinger, the average number of gas molecules absorbed by each person is ____. 2. People have the highest hair strength in youth. For example, people in the 20-year-old group can bear an average pull of 1.72 N. If the strength is taken as 1, the 40-year-old has a hair strength of 0.8, so the 40-year-old group The maximum tensile force of the hair is ____ cows. Second, multiple-choice questions (of which 3 to 7 questions for the radio; 8 and 9 questions for multiple choice)