题目内容

Putthefollowingwordsandphrasesintheblanks;eachwordandphrasecanonlybeusedonce.ononesideofmutedontheothersideofsoftnapnexttoorangelightedsizzlingcozyMykeysnapsopenthelockonthethickwoodendoor,andIfeelawarmrushofairasIwalkintothe1)________livingroom.Thewholeroomisdonein2)_________bluesandgreens.Thereisathickheavybluerugthatrunsfromwalltowall.3)_________theroomisabig,paddedgreenarmchair.Thearmslookliketheywanttopullyouinandholdyou.4)_________thechairisthetelevision,whichisturnedonataquietlevelandgivesoffthe5)_________soundsofvoicesandlaughter,whilecolorsflickacrossthescreen,6)_________theroomisaroyal-bluecouchsosoftanddeepthatitlookslikeaninvitationtotakea7)_________.Thewholebackwall,exceptfortheentrancetothekitchen,ismadeofbrickandfeaturesalargefireplace.The8)_________coalsofthefiresendawarmglowintotheroomandgiveoffquietcracklesandpops.Fromthe9)________kitchencomesthesmellofporkchops10)________invegetableoil,andthefootstepsofmymotherasshepreparesourdinner.I'mgladtobehome.

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在等直径长直管道中,液体的温度不变,当流量逐渐增大,管道内的雷诺数Re将逐渐()。

A. 增大
B. 减小
C. 不变
D. 不一定

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A. 一次方关系
B. 二次方关系
C. 1.75~2.0次方关系
D. 不能确定

写出水力半径R的表达式为:()。

圆管层流断面平均流速为最大流速的()。

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