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下表为小军家小汽车的相关数据:总质量:1600kg额定功率:100kW车轮与地面的总接触面积:8.0×10-2m2水箱容量:5L(1)小军发现他家汽车如图所示速度匀速行驶了4500m,求行驶这段距离所用的时间是多少秒?(2)该车静止在水平面上时,对地面的压强为多少Pa?(g取10N/kg)(3)假若该车在水平路面上以40kW的功率匀速行驶10min,消耗汽油1.5kg,求小汽车发动机的X效率?(ρ汽油=4.6×107J/kg)Paris —a dream city for many people!1.And from this summer, it will become a city of bicycles. On July 15 when Paris people wake up, they will find thousands of bikes are for rental (租赁).2.If you want to use longer, you should pay a little money.The stations work day and night, seven days a week.3.Encouraging people to ride bikes is good for the environment. 4.A Paris official (官员) said, "We think riding bikes may make Paris greener and quieter. With cleaner air, people can live better lives."5.Lyon, France’s third largest city, started it two years ago. Other European cities like Stockholm and Brussels do the same.根据材料内容,从下面五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺、内容完整,并将其标号填写在下面题号后的横线上。A.You can ride them for free half an hour.B.It is a city of food and art.C.Paris is not the first French city to encourage people to ride bikes.D.There will be fewer cars on roads, so less pollution.E.People can return the bikes to any of the stations.A.You can ride them for free half an hour.B.It is a city of food and art.C.Paris is not the first French city to encourage people to ride bikes.D.There will be fewer cars on roads, so less pollution.E.People can return the bikes to any of the stations.
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