如图所示,物体A、B用细绳连接后跨过定滑轮.A静止在倾角为30°的斜面上,B被悬

题型:选择题

问题:

如图所示,物体A、B用细绳连接后跨过定滑轮.A静止在倾角为30°的斜面上,B被悬挂着.已知质量mA=2mB,不计滑轮摩擦,现将斜面倾角由30°增大到50°,但物体仍保持静止,那么下列说法中正确的是(  )

A.绳子的张力将增大

B.物体A受到的静摩擦力将先增大后减小

C.物体A对斜面的压力将减小

D.滑轮受到的绳的作用力不变

考点:共点力的平衡
题型:选择题

提出“差别计件工资制度”的理论是( )

A.人际关系理论
B.一般管理理论
C.科学管理理论
D.行政组织理论

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向含有1.17g NaCl和1.17g NaF的溶液中,加入过量的AgNO3溶液,将析出的沉淀过滤、洗涤、干燥后称其质量为2.87g。根据此实验确定AgF在水中的溶解性应为(   )

A.易溶于水

B.此AgCl更难溶于水

C.与AgCl一样难溶于水

D.无法确定根据下列反应

题型:选择题

1,2,3,7,46,( )

A.2109

B.1289

C.322

D.147

题型:选择题
A doctor entered the hospital in a hurry after being called in for an urgent       .He answered the call as soon as possible, changed his clothes and went directly to the operation block.He found the boy's father       in the hall waiting for the doctor. On seeing him, the dad        , "Why did you take all this       to come? Don't you know that my son s life is in danger? Don't you have any sense of      ?"
The doctor smiled and said, "I am sorry, I wasn't in the hospital and I        as fast as I could after receiving the call...And now, I wish you'd calm down work."      I can do my work.”
“Calm down? What if your son is in this room right now, would you calm down? If your own son is      now what will you do?” said the father       .
The doctor smiled again and replied," I will say what Job said in the Bible 'From dust we came and to dust we return, blessed by the name of God'.     cannot extend lives. Go and       for your son.we will do our best by God's grace."
"Giving advice when we re not       is so easy." murmured the father.The operation took some hours       which the doctor went out happily.
"Thank goodness!  Your son is saved ! " And without waiting for the father's reply he carried on his       running. “If you have any question, ask the nurse!"
"Why is he so       ? He couldn't wait some minutes so that I could ask about my son's       ?" commented the father when seeing the nurse minutes after the doctor left. The nurse answered,        coming down her face, "His son died yesterday in a road accident.He was in the funeral when we called him for your son's operation.      now that he saved your son's life, he left running to finish his son's funeral."
Never     anyone...because you never know how their life is and what they're      .
小题1:
A.meetingB.careerC.operationD.travel
小题2:
A.callingB.runningC.jumpingD.pacing
小题3:
A.admittedB.expressedC.whisperedD.shouted
小题4:
A.timeB.costC.loveD.turn
小题5:
A.humorB.responsibilityC.prideD.honor
小题6:
A.workedB.leftC.cameD.moved
小题7:
A.in caseB.so thatC.untilD.even if
小题8:
A.dyingB.lyingC.missingD.dropping
小题9:
A.sadlyB.cheerfullyC.hopefullyD.angrily
小题10:
A.GodB.TeachersC.FriendsD.Doctors
小题11:
A.speakB.spellC.prayD.think
小题12:
A.worriedB.concernedC.lostD.tired
小题13:
A.afterB.forC.beforeD.with
小题14:
A.wayB.spiritC.trustD.dream
小题15:
A.patientB.proudC.powerfulD.absent
小题16:
A.positionB.medicineC.stateD.life
小题17:
A.sweatsB.coldC.cloudsD.tears
小题18:
A.AndB.ButC.OrD.While
小题19:
A.ignoreB.judgeC.explainD.believe
小题20:
A.doingB.loadingC.experiencingD.reducing
题型:选择题

国家自然科学基金计划、国家重点实验室计划、基础性研究重大关键计划等属于()

A.应用开发主导型

B.高技术研究发展型

C.基础研究型

D.试验与发展项目

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