123():122313231450cm123152121(PP)------2(GP)------63(GL)-----4(EP)------5(HP)------6(HL)------7(H)------8(D)------9(CV)------10(SL)------11(CL)------12VP------13------14------1512371abcdHLcv,abcdeabcdcvEPEPeEPeecv1.52bd()EPcv-dbdcv3abcdabcdbdbd81AB58HLHLCV1CV2CV1CV2ABCV1CV2AB120o150o2CV1CV2CCCCV1CV2ABECV1CV1EHLM2CV2CV2EHLM1M1M2ababcccacbABeaaeabm2bbeabm1,m1m2BHLM1M2EM1M23Bm1m2CV1-BCV2-BCV1CV24CV1CV29,12310123(1)112CAD1212313121412151617.,,,,,,18,,,.,,,,19,,,,20