同步地球卫星相对地面静止不动,犹如悬在高空中,下列说法中正确的是( ) A.我国

题型:选择题

问题:

同步地球卫星相对地面静止不动,犹如悬在高空中,下列说法中正确的是(      )

A.我国发射的同步地球卫星可以定点在北京正上方

B.质量不同的地球同步卫星轨道高度不同

C.质量不同的地球同步卫星线速度大小不同

D.各国的地球同步卫星都在同一个圆周上运动,并且加速度的大小相同

考点:万有引力定律
题型:选择题

某同学设计在KOH溶液中用铂作电极,利用CH3OH和O2的反应来构成原电池。下列说法正确的是(    ):①正极上O2得到电子,发生还原反应②每消耗1molCH3OH可以向外电路提供6mole-③该电池的总反应为:2CH3OH+3O2=2CO2+4H2O④电池放电后,溶液的pH不断升高

A.①②

B.①③

C.②③

D.③④

题型:选择题
Life is filled with challenges. As we get older we 31 realize that those challenges are the very things that 32 us and make us who we are .It is the same with the challenges that come with 32 .
When we are faced with a challenge, we usually have two 34. We can try to beat it off, or we can decide that the thing 35 the challenge isn’t worth the 36 and call it quits. Although there are certainly 37 when calling it quits is the right thing to do, in most 38 all that is needed is 39 and communication.
When we are committed to something, it means that no matter how 40 or how uncomfortable something is, we will always choose to 41 it and work it trough instead of running away from it. Communication is making a 42 for discussion and talking about how you feel as opposed to just saying what the other person did wrong. 43 you can say to a friend, “I got my feelings hurt.” 44 “You hurt my feelings,” you are going to be able to solve the problem much faster.
In dealing with the many challenges that friendship will bring to you, try to see them for 45 they are: small hurdles you need to jump or 46 on your way through life. Nothing is so big that it is 47 to get over, and hurt only 48 to make us stronger. It is all part of growing up, it 49 to everyone, and some day you will 50 all of this and say, “Hard as it was, it made who I am today. And that is a good thing.”
小题1:
A.seem toB.come toC.hope toD.try to
小题2:
A.designB.promoteC.directD.shape
小题3:
A.confidenceB.pressureC.friendshipD.difficulty
小题4:
A.opportunitiesB.expectationsC.choicesD.aspects
小题5:
A.demandingB.deservingC.predictingD.presenting
小题6:
A.commentB.lossC.troubleD.expense
小题7:
A.spansB.timesC.datesD.ages
小题8:
A.casesB.fieldsC.partsD.occasions
小题9:
A.assessmentB.commitmentC.encouragement D.adjustment
小题10:
A.doubtfulB.shamefulC.harmfulD.painful
小题11:
A.keepB.controlC.faceD.catch
小题12:
A.spaceB.planC.topicD.room
小题13:
A.IfB.AsC.WhileD.Unless
小题14:
A.other thanB.rather thanC.or ratherD.or else
小题15:
A.whatB.whoC.whereD.which
小题16:
A.pass byB.come acrossC.get throughD.run over
小题17:
A.unnecessaryB.necessaryC.impossibleD.possible
小题18:
A.servesB.meansC.aimsD.attempts
小题19:
A.opensB.appealsC.goesD.happens
小题20:
A.lock down onB.look back onC.look forward toD.look up to
题型:选择题

雾根据能见度分为雾、浓雾、强浓雾三个等级,其各自的能见度范围依次为().

A.大于等于0.5千米小于1.0千米

B.大于0.5千米小于等于1.0千米

C.大于等于0.05千米小于0.5千米

D.小于0.05千米

E.小于等于0.05千米

题型:选择题

Deck beams on a ship are generally spaced at equal intervals and run().

A.longitudinally

B.vertically

C.transversely

D.intermittently

题型:选择题

不溢式压缩模可压制形状复杂、薄壁、长流程和深形腔塑件,也适于压制流动性特别小、单位压力高、表观密度小的塑料。

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