In using reduction gears to obtain efficient propeller speeds， （）.
In using reduction gears to obtain efficient propeller speeds， （）.
According to the passage, the speeds at which a train must travel to qualify as “high-speed”______________.
According to the passage, the speeds at which a train must travel to qualify as “high-speed”______________.
High –speed rail is public transport by rail at speeds in excess of ________ km/h.
High –speed rail is public transport by rail at speeds in excess of ________ km/h.
The State Railway Administration of China defines high-speed rail as a new railway line running at speeds of over 350 km/h and a dedicated railway passenger line operating at speeds of not less than 200 km/h at the initial stage.
The State Railway Administration of China defines high-speed rail as a new railway line running at speeds of over 350 km/h and a dedicated railway passenger line operating at speeds of not less than 200 km/h at the initial stage.
Oligodendrocytes make myelin, a fatty substance that insulates nerve axons and speeds the conduction of impulses along nerve fibers.
Oligodendrocytes make myelin, a fatty substance that insulates nerve axons and speeds the conduction of impulses along nerve fibers.
New advances in wind-turbine design enable turbines to operate at lower wind speeds to convert wind ________ electricity more efficiently.
New advances in wind-turbine design enable turbines to operate at lower wind speeds to convert wind ________ electricity more efficiently.
In a sense, tourism speeds up unhealthy urbanization processes and results in traffic congestion, noise and air pollution and the dumping of waste and untreated sewage.
In a sense, tourism speeds up unhealthy urbanization processes and results in traffic congestion, noise and air pollution and the dumping of waste and untreated sewage.
The speeds at which a train must travel to quality as “high-speed” vary form country to country, ranging from _______ km/h to over ________ km/h.
The speeds at which a train must travel to quality as “high-speed” vary form country to country, ranging from _______ km/h to over ________ km/h.
What don’t athletes demonstrate in sports games? A: Speeds and skills. B: Interests and hobbies. C: Agility and strength. D: Striving and efforts.
What don’t athletes demonstrate in sports games? A: Speeds and skills. B: Interests and hobbies. C: Agility and strength. D: Striving and efforts.
High-speed rail has advantage over automobiles in that it can move passengers at speeds far ________ than those possible by car, while also avoiding _________.
High-speed rail has advantage over automobiles in that it can move passengers at speeds far ________ than those possible by car, while also avoiding _________.