关于摩擦力,下列说法正确的是( ) A.相互紧压的粗糙物体之间总是有摩擦力 B

题型:选择题

问题:

关于摩擦力,下列说法正确的是(   )

A.相互紧压的粗糙物体之间总是有摩擦力

B.正压力增大,摩擦力一定增大

C.摩擦力的方向总是与物体的运动方向在同一直线上

D.摩擦力的方向与物体的运动方向有时是一致的

考点:滑动摩擦力、动摩擦因数静摩擦力
题型:选择题

下列各组中,两数不相等的组数有

①(-3)2与-32 ②(-3)2与32 ③(-2)3与-23 ④|-2|3与|-23|[ ]

A.0组

B.1组

C.2组

D.3组

题型:选择题

对销售资料、销售人员、销售现场进行准备属于商品房销售代理流程中的( )。

A.委托人提交有关资料

B.代理机构进行营销企划

C.代理机构进行租售准备

D.代理机构租售执行

题型:选择题

商业承兑汇票既可以由付款人签发,也可以由收款人签发,但银行承兑汇票只能由付款人签发。( )

题型:选择题
That night, Joe came back home very late, pulling his heavy legs, obviously tired.He then sat down by the window, ­ 1  his head.
Hearing her husband back, Kay  2  out of the kitchen, but to her  3 , Joe sat still,
without  4 .Usually, when he came back, he would greet her with a kiss or a hug.Immediately Kay 5 something unusual.She went over to Joe and asked, “Tell me, my dear, any 6 news?”
“Well, I have to say that things are not in our  7 .It seems that I have no  8 to defeat my opponent (对手).He’s much more 9 , for he’s been holding the position for nearly four years, and people think he’s done a 10  job.Many signs show that he’s in the 11.”
“Oh, really? But I still believe you have our own  12 .You’re in your forties at the best age for a man.You’re new, so people have reasons to  13  you to do better.So let’s go to the voters and tell hem, ‘Give Joe Hart a chance, and he’ll show you who’s your better 14
Their next three weeks were spent  15  different neighborhoods, going to all kinds of parties, and making speeches at universities and gatherings.Even Judy and Julie, their small children, went from door to door,  16  their “Please vote for our daddy, Joe Hart!”
The night before the 17 vote, the whole Hart family were too 18 to fall asleep.The moment before the final result was declared, their 19 were brought to their mouths, but at last they all 20 and burst into tears.
Joe Hart became head judge of the state of Texas, USA.
小题1:
A.lifting B.raisingC.hangingD.combing
小题2:
A.walkedB.lookedC.keptD.stole
小题3:
A.angerB.joyC.surpriseD.disappointment
小题4:
A.hopeB.movementC.patienceD.smile
小题5:
A.saidB.sensedC.toldD.did
小题6:
A.luckyB.excitingC.newD.bad
小题7:
A.favorB.wayC.placeD.sight
小题8:
A.timeB.thoughtC.chanceD.wish
小题9:
A.interestingB.experiencedC.lovelyD.fit
小题10:
A.goodB.poorC.beautifulD.funny
小题11:
A.successB.officeC.leadD.government
小题12:
A.peopleB.reasonsC.rightsD.advantages
小题13:
A.forceB.expectC.orderD.ask
小题14:
A.choiceB.friendC.leaderD.person
小题15:
A.helpingB.visitingC.invitingD.traveling
小题16:
A.answeringB.repeatingC.showingD.offering
小题17:
A.finalB.nextC.firstD.close
小题18:
A.eagerB.sorryC.anxiousD.happy
小题19:
A.breathsB.worriesC.tonguesD.hearts
小题20:
A.leftB.arrivedC.laughedD.jumped
题型:选择题

对某一三角形的内角进行观测,其内角和为180°00′03″.则此次观测的三角形内角和真误差值为3″。

更多题库