在充分发展的紊流区内,同一管路的沿程阻力系数主要与()有关。A.流速 B.流量 C. 发布时间:2019-11-06 23:38 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在充分发展的紊流区内,同一管路的沿程阻力系数主要与()有关。A.流速B.流量C.管内壁相对粗糙度D.雷诺数
题型:单项选择题 The following four advertisements are from Yangtse Evening News, Mar 8th , 2012.Guitar lessonsAn excellent musician.Good at teaching kids for 5 years.Your home or mine.Call Larry at 86087593.Taxi driver wantedFull time.Experience and good knowledge of the city needed.Under 45 years old.Call Mr. White at 75132633 or 13935728866.Lost dogMedium size, spotted white short hair.Answer you when you call it David.Many thanks for returning it.Call Susan at 87328059.Flat for saleTwo bedrooms, a kitchen and a bathroom.Hot water 8:00—18:00.Beautiful sights out of the windows.QQ: 770519666.Call Ms. Green at 86777555 or 13813913788.小题1:Which of the four people may get the job as a taxi driver?A.A 50-year-old person.B.A 40-year-old person who can drive well in the city.C.A person who has just got his driver’s license.D.A person who can drive and has free time on weekends.小题2:How can you contact (联系) the owner of the flat for more information?A.By visiting her.B.By sending a letter.C.By making a phone call.D.By sending an e-mail.小题3: Who can teach children to play the guitar?A.Larry.B.David.C.Mr. White.D.Susan.小题4:When you find a medium-sized dog with spotted white short hair, you may call at_______.A.86087593B.75132633 C.87328059 D.86777555小题5:Where are these advertisements from?A.China Daily.B.New York Times.C.Yangtse Evening News.D.Jingling Evening News. 查看答案
题型:单项选择题 线性能量传递(linear energy transfer,LET)指的是()。A.高能射线在单位径迹中心轴上发散的能量B.每单位径迹中心轴上长度介质吸收的能量C.每单位径迹中心轴上长度发散的能量D.单位径迹长度介质吸收的能量E.以上都不对 查看答案