如图,已知四边形ABCD中,R,P分别是BC,CD上的点,E,F分别是AP,RP的中点,当点P在CD上从C向D移动而点R不动时,那么下列结论成立的是( ) A.线段EF的长逐渐增大 B.线段EF的长逐渐减少 C.线段EF的长不变 D.线段EF的长与点P的位置有关 试题答案 ...
The 2014 NASTT No-Dighow,eld lastonth inrlando, wasnmazing event.heechnicalessions wereeally wellttended,he exhibitall wasusy withtrongraffichroughouthe daytllimesndhe networkingessions wereantastic.hat'sroad descriptionf whatappened, now lete give youhemazing numbers: 1. 1,851ttendees -he...