有一用20℃、760mmHg的空气标定的转子流量计,玻璃的最低刻度代表V min =4m 3 ·h -1 ,最高刻度代表V max =40m 3 ·H -1 。但若用该流量计来测量30℃、真空度为200mmH 2 O柱的空气流量,求其V' min 和V' max 各为多少?(设C R 不变)已知当地大气压为760mmHg,V=C R A R [2gV f (ρ f -ρ)/A fρ ]c 0.5 。
【简答题】Unit 1 Part IV Supplementary Reading Choose the best answer to each of the following questions according to what is stated or implied in the text. 1. _____ 2. _____ 3. _____ 4. _____ 5. _____
【简答题】Unit 2 Part IV Supplementary Reading Decide whether the following statements are true or false according to the text. 1. _____ 2. _____ 3. _____ 4. _____ 5. _____