The fresh air is compressed then stored in （).

A charge of fresh air is drawn into the engine cylinder and then _____ by the moving piston_____ very high pressure.

The primary task of the compressed air system is to deliver the starting air necessary for

Open the window and let in some fresh air.（英译中)

Charging is the filling of the engine cylinder with a supply or charge of fresh air _____

In slow speed two-stroke engines, the fresh air entering begins when and stops as .A.the i

What is the function of the modern windows？A．Allow fresh air to blow in.B．Keep out the wor