________, known as backbone of modern war, were absolutely crucial to success of the first and second world wars.
A、support of the citizens
B、railway transportation
C、supply of the food
D、quick mobilization
A、support of the citizens
B、railway transportation
C、supply of the food
D、quick mobilization
A、The Trans-Siberian Railway is about a third the way around the planet.
B、Angles Flight Railway is an inclining train line with a gradient of about 42%.
C、The Rocky Mountaineer has now developed into a world-class travel experience, through spectacular scenery with truly excellent on-board service.
D、Owing to the labor force and financial technology brought by the Trans-Siberian Railway, Siberia became the main base of animal and crop husbandry in Russia.
A、navigation system
B、technology of vibration and noise control
C、intelligent adjustment and command system
D、high-speed railway clearance intrusion alarm system
A、felt ashamed for the work relied on foreigners
B、used Rackarock for the first time in the excavation of caves
C、decided to dig two shafts above Badaling Tunnel and then excavated to both ends to form six excavation faces to accelerate the progress of the project
D、reduced the cost of the project greatly and completed the construction as scheduled
A、the Pilatus Mountain Railway operates only from May to November every year
B、a cog-wheel rail is laid between the two tracks of the Pilatus Mountain Railway
C、the trains along Pilatus Mountain Railway run very slowly, and the maximum speed is only 12 km/h
D、the Pilatus Mountain Railway was suspended for only 3 times
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