[单选题]若向量、的夹角为60°,||=||=1,则·(-)=A、B、C、D、
[单选题]My sister was against my suggestion while my brother was ______ it.[ ]A. in favour ofB. in memory ofC. in honour ofD. is search of
[单选题]m、n∈R,、、是共起点的向量,、不共线,c=main,则、、的终点共线的充分必要条件是[ ]A.m+n=﹣1B.m+n=0C.m﹣n=1D.m+n=1
[单选题]Most Year 3 students in Quzhou No.1 High School are working hard day and night for the 2014 college entrance examinations, hoping to gain __________ to their dream universities.A.application B.admission C.connection D.agreement
[单选题]-- Can you lend me the book Twilight by Stephenie Meyer-- Sorry. I returned it to the library just now. Maybe it is still _____.A.availableB.affordableC.acceptableD.valuable
[单选题]已知命题“彐x∈R,2x2+(a-1)x+≤02”是假命题,则实数的取值范围是( )A.(-1+∞)B.0C.(-13)D.(-∞2-1)U(3,+∞)
[计算题]分别指出下列各题中构成的“p 或q”,“p 且q”,“非P”形式的命题,并指出真假.(1)P :3 是13 的约数,q:3 是方程x2-4x+3=0 的解;(2)p :相似三角形的对应边相等,q :相似三角形的对应角相等.
[单选题]是不共线的向量A.= Ma+b, AC=a+Ab(.E R),若,则A、B、C三点共线的充要条件为 []A.入1=2=-1B.1=2=1C.2+1D.22-1=0
[单选题]如果对于任意实数x,[x]表示不超过x的最大整数, 例如[3.27]=3,[0.6]=0. 那么“[x]=[y]”是“|x-y|<1”的[ ]A.充分而不必要条件 B.必要而不充分条件C.充分必要条件D.既不充分也不必要条件
[单选题]设四边形A.CD中,有,且,则这个四边形是[ ]A.平行四边形 B.矩形 C.等腰梯形D.菱形
[单选题]Only our partys policies will put the country back _ again. [ ]A. on its foot B. on its feetC. in its foot D. in its feet
[单选题]The traditional approachwith complex problems in our studies is to break them down into smaller,more easily managed problems.[ ]A. to dealB. having dealt C. to dealingD. being dealt
[单选题]The college ______ 7 departments, 4 institutes, and Teaching Division of Basic Computer Science and Basic Lab Center.A.consists ofB.makes up ofC.is consisted ofD.is made of
[单选题]They wanted to charge $5,000, ______ we managed to bring the price down. A.butB.soC.whenD.since
[单选题]设F1,F2是双曲线的两个焦点,P在双曲线上,当△F1PF2的面积为2时,的值为 [ ]A.2 B.3 C.4D.6
[单选题]You’d better ?your score and see if you have passed the exam.A.add up toB.add toC.add upD.Add
[单选题]The naughty boy spends most of his time playing computer games ______ his lessons.[ ]A. rather than studyB. other than studyingC. rather than studying D. other than to study
[单选题]已知平行四边形ABCD的对角线AC和BD相交于O,且OA=,ob 6,且满足BEEC,则AE=( )A.b-3aB.3Q×bC.q2bD.2Q\\72b
[单选题]Rather than _______ here waiting, I prefer _______to find out what on earth has happened.A.sit ; goingB.sit ; goC.sitting ; goD.sit ; to go
[单选题]Students in that school are judged ________what they have achieved in their studies. [ ]A. in spite ofB. in charge ofC. in favor ofD. in terms of
[单选题]Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.A.in whichB.from whichC.by whichD.on which