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問題的種類

英文 高中

請問這題的B.和C.要怎麼判斷 謝謝

第43. 至46. 題為題組 It might be hard for us to imagine having Coca-Cola as the only drink instead of fresh water. Yet, it has been the case in San Cristóbal for the past few decades. Located in southeastern Mexico, San Cristóbal, once a rainy place, can only enjoy potable water every other day. Water does trickle down from public pipes, but it's all but undrinkable, with too much chlorine. The locals find water purifiers unaffordable or even unimaginable. Hence, they end up drinking Coca-Cola, which is produced locally and far more readily available than tap water. With residents there drinking on average more than two liters of Coca-Cola on a daily basis, the real price to pay for such an alternative to plain water, however, is the sacrifice of people's physical health. Diabetes has been one of the leading causes of death, second only to heart disease, though the latter also has a lot to do with one's sugar consumption. Struggling with obesity and the many chronic diseases is now defining many local people's adolescence and adulthood. Annually, more than 3,000 lives of San Cristóbal are claimed due to their unhealthy drinking habit. The culprit, as most locals believe, is the bottling plant for Coke, a Mexico-based multinational food company owned by Femsa. The plant, with its contribution to the government's tax revenue, has long been granted daily access to more than 300,000 gallons of water in San Cristóbal to churn out the a

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數學與統計 大學

大一公衛系微積分,求第二題解

公衛系 微積分期末考 (28/12/2018) 1. Use the Laplace transform to solve the differential equations. (1) j(t)+2y(t) = x(t), y(0)=1, x(t)=10, t20 (20) (2) Intravenous glucose is a treatment. Disposed at a fixed rate k grams per minute inputs into the blood, while blood glucose will be converted to other substances or moved to another place, at a rate proportional to the amount of glucose in the blood, the proportionality constant is a (a> 0), the initial amount of glucose in the blood is M. A. Find the variation in the amount of glucose in the blood (15) B. Determining the equilibrium, the amount of glucose in the blood. (5) = 2. SI Epidemic Model : The size of the population, n+1, remains fixed. Let i(t) be the number of infectives at time t, and let s(t) be the number of individuals who are susceptible. Given an initial number of infectives iO), we would like to know what will happen to i(t). SI Epidemic Model is described by the differential equation. di(t) = k·i(t).s(t) ......(5.1) dt i(t)+s(t)=n+1 i(0)=i, (1) Solve this differential equation of the SI Epidemic Model (5.1). (10 h) (2) What is the peak times t of the epidemic spread? (10) 3. Consider the Two-compartment physiological models and is shown in figure 1. C1 (t) represent the drug concentration in the first compartment and C2 (t) represents the drug concentration in the second compartment. Vi and V2 represent the compartment volume. Use the first order linear differential equation general solution to solve the C1 (t) (20 ) and use the Laplace transform to solve C2 (t). 【20 分). | 世」!()

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