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若关于x的一元二次方程x2+(2k﹣1)x+k2=0的两根a、b满足a2﹣b2=0,双曲线(x>0)经过Rt△OAB斜边OB的中点D,与直角边AB交于C(如图),则S△OBC为( )
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AMESAustralia﹣FlagstaffisgladtoofferyouaplaceinCertificate证书inSpokenandWrittenEnglish.ThiscourseispartoftheAdultMigrantEnglishProgramfoundedbytheAustraliaGovernmentDepartmentofEducation&Training. Coursedatesare03.10.2017﹣14.12.2017 ●Timetable ●Thisis12hoursperweek. ●Ifyoucan'tattendonthefirstdayyoumusttellus.Pleasecontacttheofficeon99264717. ●Ifyouneithercontactusnorattendonthefirstdayyoumayloseyourplaceintheclass. ●Ifyourchildrenneedcarepleasecontactus. ●Ifyouneedtogiveupthecourseyoumusttellbothyourcounselorandyourteacher. 25.HowlongwilltheSpokenandWrittenEnglishcourselast A.Aboutthreedays. B.Over2months. C.About11months. D.Lessthan2months. 26.What'stheChinesemeaningofcounselorinthepassage A.顾问 B.班主任 C.辅导员 D.考官 27.WhichofthefollowingisTRUEaccordingtothecourse A.Room5isonlyforLevel4students. B.Peopleofallagescantakethiscourse. C.YoucanhavelessonsinRoom2onMonday. D.You'resuretoloseyourplaceunlessyouattendonthefirstday.
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