如图ＡＢ∥ＣＤ，∠NCM＝90°，∠NCB＝30°，CM平分∠BCE，求∠B的大小．
问题详情：如图ＡＢ∥ＣＤ，∠NCM＝90°，∠NCB＝30°，CM平分∠BCE，求∠B的大小． 【回答】.解：∵CM平分∠BCE，∴∠BCE=2∠BCM．∵∠NCM＝90°，∠NCB＝30°，∴∠BCM=60°．∴∠BCE=120°．根据两直线平行，同旁内角互补，∵ＡＢ∥ＣＤ，∴∠BCE+∠B=180°．∴∠B=60°．知识...
用“NCB”造句大全，NCB造句
WesuggestedthatalltheEarlyPaleozoicpolesforNCBwereplacedintheAtlantic,andtheNCBlocatedinthesouthernhemisphereatabout15degreesintheEarlyPaleozoic.Intervention:minimalanterolateralacromialapproachtothep...