一工程计划运走一堆重达100吨的沙石，开工后，增加了运输车辆，使运沙石的速度比原计划提高了一倍，结果提前4小时完成任务，原计划每小时运沙石多少吨？-数学

更多内容推荐

• 某单位盖一座楼房，由建筑一队施工，预计180天能盖成．为了能早日竣工，由建筑一队、二队同时施工，30天完成了工程总量的13，那么由二队单独施工需要多少天才能盖成楼房？-数学
• The poor little boy________by his heartless parents was seen begging in the street.A．abandoningB．to
• It is no use________without doing.A．to promiseB．promisingC．promiseD．to be promised-英语
• 若1a-1b=5，则分式2a+3ab-2ba-2ab-b的值为（）A．135B．-35C．35D．1-数学
• Many residents are opposed to ________ (build) the motorway. It is not a wise decision.-高三英语
• (2014·湖南省邵阳市模拟)Some of us remain________at our computer for hours every day，forgetting moving our bo
• 一项工程，甲单独做5小时完成，甲、乙合做要2小时，那么乙单独做要______小时．-数学
• 小鹏和小凯两位同学都住在离学校3.6千米的A地，他们同时出发去学校，小鹏出发走100米时，发现忘了带作业本，便立即返回，取了作业本又立即从A地去学校，结果两人同时到达了-数学
• AB两地的距离是200千米，一辆公共汽车从A地驶出2小时后，一辆小汽车也从A地出发，它的速度是公共汽车的2倍，已知小汽车比公共汽车还早30分钟到达B地，求两车的速度．-数学
• ______with so much trouble, we failed to complete the task on time.A．Face B．Facing C．Faced D．To face
• Every time he had a chance，he would talk about the great difficulty he hadin the new country．A．settl
• _________ in the mountains for a week, the two students were finally saved by the local police.A．Hav
• Throughout history，the language________by a powerful group spreads across a civilization.A．speakingB
• David threatened________his neighbour to the police if the damages were not paid.A．to be reportedB．r
• 请你先化简分式x2-2xy+y2x2-xy÷(xy-yx)，再将x=3-3，y=3代入求值．-数学
• 已知a、b均为正数，且1a-1b=-2a+b．则(ba)2+(ab)2=______．-数学
• The rescue team has saved more than ten people________under the collapsed buildings since the earthq
• 甲乙两人分别从距目的地6千米和10千米的两地同时出发，甲乙的速度比是3：4，结果甲比乙提前20分钟到达目的地，求甲、乙两人的速度．-数学
• Nobody but doctors or nurses and those __________ by Dr. Hu ________ to enter the patient's roo
• —You need to start exercising again, I guess.—Well, I have been attempting ________ (eat) less recen
• In order not to get into trouble, advertisers are increasingly cautious about taking out ads ______(
• ____ abroad for a tour can be a great honor for an ordinary person like me.A．TakenB．TakingC．Being ta
• ___ an answer, I wrote to him again.A．Having not receivedB．Not having receivedC．Not receivingD．Did n
• The old car needs__________，but I have no time to have it________.A．to repair；repairedB．to be repair
• 若a-b=3ab（ab≠0），则1a-1b=______．-数学
• 在社区全民健身活动中，父子俩参加跳绳比赛．相同时间内父亲跳180个，儿子跳210个．已知儿子每分钟比父亲多跳20个，父亲、儿子每分钟各跳多少个？-数学
• 小丽乘坐汽车从青岛到黄岛奶奶家，她去时经过环湾高速公路，全程约84千米，返回时经过跨海大桥，全程约45千米．小丽所乘汽车去时的平均速度是返回时的1.2倍，所用时间却比返-九年级数学
• You are so dependent that I’m afraid you can’t adjust yourself to________alone for a time.A．leaveB．l
• Usually I don't allow________in my office，but yesterday I allowed him________ here.A．smoking；to
• The problem referred to at the class meeting, if ______________ in time, will make a bad effect on e
• The big house was burnt down in the big fire, nothing ________.A．remainedB．leftC．was remainingD．leav
• In the near future, China will increase supply of smaller houses, to help low-income families to buy
• The ability _____ an idea is as important as the idea itselfA．to expressB．expressedC．expressingD．to
• 化简（a2-4a2-4a+4-12-a）÷a2a2-2a的结果是______．-数学
• 先化简，再求值：（4a-1-3a+1）÷aa2-1，其中a=-5．-数学
• 如图所示的电路总电阻是6Ω，若R1=3R2，则R1、R2的值分别是[]A.R1=45Ω，R2=15ΩB.R1=24Ω，R2=8ΩC.R1=Ω，R2=ΩD.R1=Ω，R2=Ω-八年级数学
• They will start their project ____at helping the poor children to be educated in China＇s west.A．aims
• A、B两地相距140千米，甲乙两车同时从A、B两地出发相向而行，相遇时甲车距B地60千米，已知甲车比乙车每小时快15千米．求甲、乙两车的速度．-数学
• Bill suggested________a meeting on what to do for the Shanghai Expo during the vacation.A．having hel
• The disco music，digitally________in the studio，sounded fantastic at the party that night.A．recordedB
• 列方程解应用题：在九台市城市道路改造中，决定对一段公路进硬化，已知这项工程由甲队做要40天完成，如果由乙队先做10天，余下的工程由两队合做还要20天才能完成．（1）求乙队单-数学
• (2014·湖南部分重点中学5月联考)She couldn’t wait________home after such a long and tiring journey.A．goingB．to go
• She will tell us why she feels so strong that each of us has a role________in making the earth a bet
• ________ themselves, the employees in this company usually have a coffee or tea during their break t
• I always hate________when reviewing lessons and appreciate________alone.A．disturbing；stayingB．to dis
• 化简(x2-1x2-2x+1+1-xx+1)÷xx-1的结果是______．-数学
• 先化简下式，再求值：2x2+y2x+y-x2+2y2x+y，其中x=2+1，y=22-2．-数学
• 某市为治理污水，需要铺设一段全长为300米的污水排放管道、铺设120米后，为了尽量减少施工对城市交通所造成的影响，后来每天的工效比原计划增加20%，结果共用15天完成这一任-数学
• Lydia doesn't feel like________abroad. Her parents are old.A．studyB．studyingC．studiedD．to study
• He would be sure ________ disasters if I didn't stay to keep an eye on him.A．of meetingB．about