12.BF(xin)еġСW(xu)̎I(y)Ҏ(gu)l
13.AB(yng)˵Ļӣ̎ǽӵ(do)̎eֹW(xu)Сʾԡˡˎ̎ОҎ(gu)ʾԛQġ
14.D}錦O(sh)ЇɫxĻĸĴ_JO(sh)ЇɫxĻĸǡȫγɹͬ;֧
15.BW(xu)oW(xu)` 1718 oW(xu)ֻڲ|̕rֲΑB(ti)ԼЩwоl7 oӢƌW(xu)ҹSѪҺѭh(hun)W(xu)fwĹԭ_Ļ˽.ǬF(xin)W(xu)cl8 orʿW(xu)ƶˌֲķ
16.BR}Ŀ@D(zhun)@̫D(zhun)̫̎λڕr׃ڵϿ̫IJҲ׃(do)³F(xin)ġAȱF(xin)
17.D}ּڿ鿼֪RJ٬F(xin)A 헑(yng)ǖ|hhB 헑(yng)γлӡˢC 헡ͻ𘌡γֻ D 헷}
18.DՓZfӺͶͬСͬ͡Ͷͬ˼fҊԲͬҪ̎.Ҫͬ殐ĻP(gun)ϵxϿ@̎ͬĻP(gun)ϵ߾ͶͬӳĻаԵcABC 헶}ʴ𰸞 D
19.CfǰĿˡͯ¹u߽Ĺ
ܕrg֮·߅ǎrx C
20.B{LȆλ1nm 10-9mڱʾIJLԼ{g(sh)
21.C8,12,16,30,18,10 㔵(sh)ƽ(sh)(8+12+16+30+18+10)M6 15.67]б(sh)Д(sh)(12+16)/2=14ƽ(sh) Դx C.
һ쎟쎟̎r̎Q·zy̎˴TעԽrO(jin)̎ԃ̎خa(chn)r l(xing)Ҏ(gu)Y(ji)(gu)̎r̎ȫ̎O(sh)O(jin)펟h(hun)Ӱurصӛ·r·O(jin)펟̎ůͨ̎oˮ̎Ӌ̎