色www,五月婷婷深爱五月,午夜国产一级片,色噜噜综合,国产大胸无码视频,清纯美女被操黄网站在线观看,波多野结衣av高清一区二区三区

иx}x

l(f)r(sh)g:2017-12-26 ݋:ٱ

иxʮ(jng)}У}yЃHƒ(ni)СY(ji)}„֮ɫ׃һy}Ҫ}Ľ}_ҪǰҪ܉(zhn)_ҵԓ}(j)СռP(gun)иx}P(gun)xϣ(du)

иx}x

ô(j)(li)Ժ̎?(dng)ȻԭôΏãã~ҵ@һ(j)?Ǹ(j)}}ĕr(sh)}ɾããеһ(hu)҂ָ_ķ

Eһ}ͨ^(gu)}_}팦(du)

Eԭi팦(du)λ@r(sh)ַփɷNr팦(du)ԭij(g)еһ(g)־һ(g)t(j)ڱʣµă(ni);팦(du)ԭһ(g)ľУt(j)ҪY(ji)

@}(TPO24)

By whatever means, a lake is constantly gaining water and losing water: its water does not just sit there, or, anyway, not for long. This raises the matter of a lake’s residence time. The residence time is the average length of time that any particular molecule of water remains in the lake, and it is calculated by dividing the volume of water in the lake by the rate at which water leaves the lake. The residence time is an average; the time spent in the lake by a given molecule (if we could follow its fate) would depend on the route it took: it might flow through as part of the fastest, most direct current, or it might circle in a backwater for an indefinitely long time.

It can be inferred from paragraph 4 that the length of time a given molecule of water remains in a lake

A. depends entirely upon the average speed of a lake' s currents

B. can be measured by the volume of the lake alone

C. can be greater or lesser than the residence time

D. is similar to the length of time all other molecules remain in that lake

Ȍ}҂֪팦(du)the length of time a given molecule of water remains in a lake Ȼͨ^(gu)λҵԭİ팦(du)ľԭһԒĺ“The residence time is an average; the time spent in the lake by a given molecule (if we could follow its fate) would depend on the route it took: it might flow through as part of the fastest, most direct current, or it might circle in a backwater for an indefinitely long time.”ԒԷ̖(ho)ֳǰɂ(g)־ǰһ(g)־ҲҪǰһ(g)־“The residence time is an averageͣr(sh)gƽ”@(g)Ϣc(din)Ҫӛס(li)ٰѺ俴䣬“the time spent in the lake by a given molecule would depend on the route it tookһӵˮͣںĕr(sh)gȡQߵ·”[˼ˮͣںĕr(sh)gDz̶ߵ·ֱtͣr(sh)gߵ·ѭh(hun)tͣr(sh)gL(zhng)Y(ji)ǰһ(g)־ɵóY(ji)Փһӵˮͣںĕr(sh)gܱresidence time L(zhng)Ҳܱʴ𰸞C

ͨ^(gu)v}ſ܉(j)ķ򣬺(jin)֮팦(du)ľtY(ji)Č(j);팦(du)ľDzt(j)N(yn)ڱ

]
T(mn)]