Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.
举一反三
- In order to keep the engine speed constant, the engine bleed will lead to（）
- The engine may lose power or slow down during running， when this occurs， the first cause possible may be hot bearings and （） of the pistons in the cylinders.
- The phenomenon of flutter occurs: A: Rather at low speed and low altitude. B: Rather at high altitude and high angle of attack. C: Rather at high speed. D: Rather transonic, beyond the critical Mach.
- You may have to ________ new eating habits in order to keep healthy.
- A)They tend to drive responsibly.B)They like to go at high speed.C)They keep within speed limits.D)They follow traffic rules closely.