Acute(急性) and chronic(慢性) toxicity Acute toxicity refers to a rapid and serious response to a high but short-lived dose Acute poisons interfere with essential physiological processes, leading to a variety symptoms of distress, even death Chronic toxicity refers to a time-lagged response to a relatively low but prolonged exposure

I. Explain the italicized words or phrases in the following sentences. (20%) 1. Every here and there, a doorway gives a glimpse of a sunlit courtyard, perhaps before a mosque or a caravanserai

A current-carrying conductor produced a magnetic field (1800). A changing magnetic field could induce a voltage in a neighboring circuit(1820)

一、单项选择题(每小题1分,共10分) 1.a2.c3.c4.a5.6.a7.c8.c9.c10.a 二、多项选择题(每小题2分,共20分) 1. ABC 2. ABCD 3. ABD 4. ABC 5. BCDE 6. BD 7.AC 8. ABC 9. ABCD 10. BCD

In this lecture, we consider the problem of a body in which the mass of the body changes during the motion, that is, m is a function of t, i.e. m(t). Although there are many cases for which this particular model is applicable, one of obvious importance to us are rockets. We shall see that a significant fraction of the mass of a rocket is the fuel, which is expelled during flight at a high velocity and thus, provides the propulsive force for the rocket

flow networks Definition. A flow network is a directed graph G=(, E)with two distinguished vertices:a source s and a sink t. Each edge(u, v)E E has a nonnegative capacity c(u, v). If(u, v) E, then c(u, v)=0 Example: c 2001 by Charles E Leiserson

In this lecture we will consider the equations that result from integrating Newtons second law, F=ma, in time. This will lead to the principle of linear impulse and momentum. This principle is very useful when solving problems in which we are interested in determining the global effect of a force acting on a particle over a time interval Linear momentum We consider the curvilinear motion of a particle of mass, m, under the influence of a force F. Assuming that

1、罗尔中值定理 罗尔(Rolle)定理如果函数f(x)在闭区间 a,b]上连续,在开区间(a,b)内可导,且在区间端 一点的函数值相等,即f(a)=f(b),那末在(a,b) 内至少有一点E(a<