搜索
3011200111PhysicsTeachinginMiddleSchoolVol.30No.11Nov.2001(226400),,,,,.,:()(1).ABC,C=AB,ABC:A,180B(),C,1.11,.:,,.,,,,.2(a),F1F2,O,L1L2F1FM=LF,LFM,M1M2:F1M1,L1180F1,M1,M1z,M1,2(b).F2M2,L2F2,M2z,M2,2(c).221,,,3.Ξ,33,Ξ().,Ξrvv=Ξr,.v,,ΞΞ,2..71:,,4.431,,5.,,.5,I,Idlr2,dB=Λ04ΠIdlrr3,,IdlrdB,Idlr,,,.41,.66,qv,f=qvB,,vBf.,vB,,,.,,51,,,.7,CD,E=DC(vB)�dl,,7,vB,,vB,CD,CD,,CD,.,,,,,vB,fFE,.,,.1,..:,19822,..:,5(6).198:2001-0-1881