【简答题】According to a news report, the 309 service staffs working in the Beijing-Shanghai high speed railway were selected from more than 5,000 employees of the Beijing Railway Bureau. These members must mee...
【单选题】The common rail engines show great advantages in combustion especially______ .
A.
at high speed and full load
B.
at low speed and part load
C.
when heavy fuel oil is used at sea
D.
when the ships run long distance
【单选题】When the students heard the news, all of them were in _____.
【单选题】Look, the roller coaster !
A.
how high speed; is moving
B.
what high speed; is moving at
C.
how a high speed; is moving at
D.
what a high speed; is moving
【多选题】Tickets on high-speed trains are generally divided into:____________________ , business class seat and luxury soft sleeper.
【单选题】下列化合物中具有强烈天蓝色荧光的是( )
【单选题】光子能量E与波长λ、频率ν和速度C及h(普朗克常数)之间的关系为( )
【单选题】下列化合物中具有强烈天蓝色荧光的是( )