When considering air: 1 - Air has mass 2 - Air is not compressible 3 - Air is able to flow or change its shape when subject to even small pressures 4 - The viscosity of air is very high 5 - Moving air has kinetic energy The correct combination of all true statements is: A: 1, 2, 3 and 5 B: 2, 3 and 4 C: 1 and 4 D: 1, 3, and 5

1 ()the destination 2() a job 3() the goods by air4()the notice on the board5()travel insurance

There’s a feeling of unrest nowadays. A: in the air B: on the air C: by air D: in air

4. From the control tower, air traffic controllers coordinate aircraft movement both ________ and on the ground. A: on the air B: in the air C: at the air D: of the air

智慧职教: Compressed air is supplied by air compressors to air receivers.

U6 E4: 1) How many components are there in an air waybill? A: 4 B: 5 C: 6 D: 7

An air waybill is used for air transport. It is an evidence of a ( ).

The air leakage of tubular air preheater is larger than that of rotary air preheater (). A: Right B: Wrong

What is the talk mainly about A: The definition of air pollutant. B: The causes of air pollution. C: The dangers of air pollutants. D: Ways to fight air pollution.

In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve? A.Noise coming from that air starting valve B.Continuous operation of the starting air compressor C.Zero air pressure in the air starting system D.Overheated starting air pipe to the cylinder head