【判断题】发动机在实际工作过程中,为了减少进气阻力,进气门通常要提前打开
【单选题】Sometimes the biggest changes in society are the hardest to spot precisely because they are hiding in plain sight. It could well be that way with wireless communications. Something that people think o...
A.
social changes are complex in nature
B.
people may ignore wireless communications changes
C.
nomadism is nothing new in society
D.
everybody can work outside their offices
【简答题】By the time you get back, great changes __________in this area. A.will take place B. are taking place C. will have taken place D. are to take place
【单选题】Light bulb which was invented by Edison _________now. [ ]
【单选题】Mobile phone is _____ used by many people _____ a communication tool. [ ]
【简答题】It is a language widely used in the world.
【判断题】YZ-1型空气制动机在控制单机运行时,用作单独制动阀的空气制动阀实施均衡风缸的压力控制,再通过分配阀均衡部去控制制动缸的压力变化,从而实现制动和缓解作用。
【单选题】In the past few years there _ great changes in my hometown. [ ]
【简答题】Why could not ceramics be used widely in the past?
【单选题】Why has growing population of young people caused the changes in museums?
A.
Because they are better educated.
B.
Because they have less spare time.
C.
Because they are stronger.
D.
Because there are more young people.