20以内三连加法口算练习题(已排版)时间:错误率:5+7+5=5+12+2=7+2+4=10+6+3=17+2+1=2+1+11=2+9+2=7+6+4=6+8+2=8+4+5=...
20以内三连减口算练习题(已排版)时间:错误率:16-6-8=13-1-11=12-4-7=13-6-3=16-5-1=11-4-1=13-3-10=18-10-5=12-3-8=6...
20以内加减法口算练习题时间:错误率:6+7=11-6=5-1=18-8=8-7=12+1=20-11=8+10=7+9=13-13=19-6=1+6=16-13=16+3=20-3=11+7=...
INMEMORIAMAnna-MarieGron,1928-2010Anna-MarieGron,aretiredprofessorandresearchorthodontistatHarvardUniversityandTheForsythInstitute...
ORIGINALARTICLEFactorsassociatedwithinitialstabilityofminiscrewsfororthodontictreatmentHoi-JeongLim,aChun-SunEun,bJin-HyoungCho,cK...