[单选题]设△ABC的三个内角A,B,C,向量,,若,则C=A、B、C、D、
[计算题](本题满分12分)已知向量a=(sin 6, cos 6-2 sin 6),b=(1:2),(I)若∥,求tan e的值;(II)若,0<日<丌求的值.
[单选题]Mr. Alexander doesn’t just write for fun; ______, writing is his bread and butter.A.at lastB.in factC.in a wordD.as a result
[单选题]6=30是cos26=2的( )A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分又不必要条件
[单选题]All the teachers are against the idea tothe new teaching building beside the sports ground.A.build upB.findC.setD.locate
[单选题]The time and effort he has devoted during the past few years____ trees in that remote area is now considered to be of great value.A.to plantB.to plantingC.plantD.planting
[单选题]The written record of the conversation doesn’t correspond ______ what was actually said. A.byB.toC.inD.at
[单选题]已知向量a b,且AB=a+2b,BC=-5a+6b,CD=7a-26,则一定共线的三点是( )A.A、C、DB.A、B、DC.A、B、CD.B、C、D
[单选题]My husband could not be here tonight, but I want to thank you ________ him. [ ]A. on behalf ofB. stand forC. because ofD. for the benefit of
[单选题]Whom would you rather _______ with you to the library?A.wentB.have goC.have goneD.go
[单选题]After that he knew he could_any emergency by doing what he could to the best of? his ability.A.get away withB.get on withC.get throughD.get across
[单选题]He argued ______ smoking, and insisted that it was ______argument that smoking was harmful to health.A.for; beyondB.against; overC.for; overD.against; beyond
[单选题]钱大姐常说“便宜没好货”,她这句话的意思是:“不便宜”是“好货”的 ( )条件.A.充分B.必要C.充要D.既不充分也不必要
[单选题]__________ the crisis of economy getting more and more serious, the government is searching for ways to improve people’s life.A.AsB.ForC.WithD.On
[单选题]下列说法正确的是[ ]A.向量与向量是共线向量,则A、B、C、D必在同一直线上B.向量与平行,则与的方向相同或相反C.向量的长度与向量BA的长度相等D.单位向量都相等
[单选题]After a second thought, Bill ________ a better idea of how to solve the problem.A.put up withB.came up withC.kept up withD.mixed up with
[单选题]已知AD BE分别是△ABC的边BC. Ac上的中线,且AD=abe=b,则BCA.4-32-3bB.2-34-3bC.2-32b3D.a+-b
[单选题]Students should form the habit of ____ everything important in class. Which of the following can’t be put in the blank?A.putting downB.taking downC.setting downD.tearing down
[计算题]已知a∈R,命题p:实系数一元二次方程x2+ax+2=0无实根;命题q:存在点(x,y)同时满足x2+y2=4且(x+a)2+y2=1;试判断:命题p是命题q的什么条件(充分、必要、充分不必要、必要不充分、充要或既不充分也不必要条件)?请说明你的理由.
[单选题]---Where to, Madam---________at the Baiyun Hotel, No 11 Sanlitun Road, Chaoyang District, please.A.Pick me upB.Call me upC.See me offD.Drop me off
[单选题]在Rt△ABC中,∠C=90°,AC=4,则等于A.-16 B.-8 C.8 D.16