t0=27 C,ȶUιˮĸ߶ȲΪ?h=25 cm,ʱײΪL=50 cmպϷK,ʹ¶Ƚ-57 C,Uιˮҹˮ25 cm:
ٴʱײ߶L'; ĸ߶H
34. [һѡ3-4](15 ) .
(1)(5)˵ȷ_______(ȷ𰸱,ѡһ2,ѡ4,ѡ5֡ÿѡһ3 ,͵÷Ϊ0)
A.ڵأڳ͵صٶй B.ùάϢǹӦ.
C. abͬһ˫װϵõĸͼ,aƼСbƼ,жˮaʱb D.ݳֲɫǹɵ E.Ӧ˼ƽԺõص
(2)(10)ͼʾ,CǰԲβԲ,CDǰԲβĶԳֽĽ,ABCDȾƽеͬɫϸ,һֱCDõĹ(DǴ),CDƶ,ϵõһP(ͼδ),֪Բβ
uuuruuur1uuur93R,Bİ뾶R, AC?CB?R,CD?28nB?3 ,:
ٹPDľ;
AnA(øʽʾ)