某房间设计热负荷为 1600W,室内设计温度 18℃,设计供回水温度 95/70 ℃,室内安装 M-132型散热器,其传热系数 K=2.426Δt 0.286W/(m2·℃) ,则理论上房间所需散热面积为( )。
A
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下列关于洁净室压差控制的说法,哪几项是正确的?()
关于离心式通风机性能特点的一般性原则表述中,正确的是下列哪几项?()
有一两级除尘系统,系统风量为2.22m3/s,工艺设备产尘量为22.2g/s,除尘器的除尘效率分别为80%和95%,该除尘系统的排空浓度为()。
TheeffectofDarwinistideaof“survivalofthefittest”wasshatteringin()’sfictionalworldofjungle,where“killortobekilled”wasthelaw.
严复翻译的《天演论》,其原文的题目是()
Thereply,whenitfinallycame,was________thenegative.
Likeallnaturalists,()wasrestrainedfromfindingasolutiontothesocialproblemsthatappearedinhisnovelsandaccordinglyalmostallhisworkshavetragicendings.
WhichoftenfollowingstatementsisnottrueaboutBritishcoalmining?
OxfordAdvancedLearnersDictionary’,3rdEdition(1980),isamongthebest-knownBritish______dictionaries.
ModernEnglishwordsman,woman,child,eat,fight,etc,originatefrom______.
“Thedignityofmovementofanicebergisduetoonlyone-eighthofitbeingabovewater.”This“iceberg”analogyaboutprosestylewasputforwardby().
DuringtheSecondWorldWar,Roosevelt,StalinandChurchillmetat________.
Jameshasjustarrived,butIdidn’tknowhe________untilyesterday.