用换元法解方程3x2+15x+2x2+5x+1=2时,设x2+5x+1=y,则原

题型:选择题

问题:

用换元法解方程3x2+15x+2
x2+5x+1
=2
时,设
x2+5x+1
=y
,则原方程变为(  )
A.3y2+2y-7=0B.3y2+2y-5=0C.3y2+2y-2=0D.3y2+2y+1=0
考点:一元二次方程的解法
题型:选择题

两个小灯泡的标识分别是L1“6V、6W”,L2“6V、9W”,把它们分别接在同一直流电源上,L1消耗的功率恰好为6W,则L2消耗的功率为(电源内阻不可忽略)[ ]

A.一定小于9W

B.一定等于9W

C.一定大于9W

D.条件不足,不能确定

题型:选择题

某儿,2岁,1周前受凉,咳嗽,3d来发热,呕吐,烦躁,体检:体温39℃,精神萎靡,脑膜刺激征阳性,为确诊需做腰椎穿刺术,护士配合腰椎穿刺术下列哪项不妥

A.取侧卧位

B.头部俯屈到胸

C.协助病人时动作轻柔

D.头部去枕使脊椎高于头位

E.双膝弯曲腹背呈弓形

题型:选择题
计算:
(-2)2
=______,(-
2
3
6
)2
=______.
题型:选择题
阅读下面短文,掌握其大意,然后从36-55各题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
As of Monday, Amy Carrickhoff’s video “Spoiled deer getting her bottle” was viewed more than 792,000 times and shared 9,600 times. In this heartwarming video, Carrickhoff stands outside her house in Oakridge, North Carolina, ______ for a deer she has named “Little Girl.” The deer comes out of the ______ and jumps on her. It hurries up the driveway and ______ Carrickhoff into the house, where it then sucks down a baby bottle of goat’s milk. When the ______ is gone, Carrickhoff wipes its mouth with a tissue.
While some animal lovers were touched by the obvious ______ Carrickhoff had with the deer, others felt she wasn’t doing the deer any ______. They said she was allowing the deer to get too ______ around humans and it could have been hit by a car, been shot by a hunter, or hurt someone. “You just gave this animal a death ______ — you also have put all your neighbors and their children at ______ of being attacked when this deer matures, and when it doesn’t get ______, it attacks someone,” one reader wrote.
Carrickhoff’s comment was that if she had known the video would get so many ______ she would have changed out of her gym clothes. As for the deer, ______, the update isn’t a happy one.
Little Girl continued coming back for bottles until around January 2011, when it moved onto ______ deer food, Carrickhoff said. “She walked off into the woods and we never saw her again,” she said. “We ______ those woods … we never found anything.”
Looking back, Carrickhoff said getting to know the deer was a special ______ that she wouldn’t regret.
Friends had brought Little Girl to Carrickhoff’s home because the woods in their backyard were protected, and the deer would be ______ from hunters. School children loved visiting the gentle creature, who would ______ them with its soft tongue and didn’t mind being ______.
Carrickhoff is confident that she didn’t over-domesticate (过度驯养) the animal. Even when Little Girl was bottle-fed, she lived in the woods and did “deer things”, Carrickhoff’s daughter said. The deer gave birth to a ______ of its own the following June, and toward the end, it wouldn’t come when it was called. It was becoming ______ again.
She and her husband got so attached to Little Girl that they don’t ever want to take care of another animal. “I just watch the videos and she kind of lives on,” she said.
小题1:
A.huntingB.askingC.callingD.applying
小题2:
A.houseB.woodsC.cageD.garage
小题3:
A.walksB.takesC.followsD.watches
小题4:
A.animalB.milkC.bottleD.time
小题5:
A.appointmentB.accommodationC.peaceD.bond
小题6:
A.favorB.harmC.serviceD.business
小题7:
A.comfortableB.excitedC.uneasyD.embarrassed
小题8:
A.sentenceB.punishmentC.directionD.prediction
小题9:
A.sightB.mercyC.momentD.risk
小题10:
A.huntedB.fedC.respectedD.welcomed
小题11:
A.copiesB.cheersC.attacksD.views
小题12:
A.fortunatelyB.hopefullyC.sadlyD.doubtfully
小题13:
A.sufficientB.rareC.regularD.favorite
小题14:
A.protectedB.watchedC.enteredD.combed
小题15:
A.eventB.experienceC.incidentD.accident
小题16:
A.discouragedB.safeC.partedD.invisible
小题17:
A.liftB.lickC.touchD.taste
小题18:
A.cheatedB.caredC.studiedD.petted
小题19:
A.sisterB.brotherC.babyD.beast
小题20:
A.timidB.tamedC.wildD.natural
题型:选择题

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