单选题A high rate of separation between oil and water is favored by （）.A large size of oil globuleB low temperatureC high viscosityD high flow rate

Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.

A.prevent heat corrosion to internal components

B.increase fuel delivery rate and economy

C.prevent pre-ignition

D.avoid carbonization of the nozzle tips

The height of tide is the ______.

A.depth of water at a specific time due to tidal effect

B.difference between the depth of the water and the area's tidal datum

C.difference between the depth of the water and the high water tidal level

D.difference between the depth of the water at high tide and the depth of the water at low tide

A.going up

B.goes up

C.gone up

D.to go up

OIL-IN-WATER are ______．

A.sediment of oil in water

B.oil dissolvents in water

C.solid oil aggregates

D.droplets of oil suspended in water

A high rate of separation between oil and water is favored by ______.

A.large size of oil globule(小球)

B.low temperature

C.high viscosity

D.high flow rate

The difference in water spray pattern between the high-velocity tip and low-velocity applicator used with the all-purpose nozzle is due to ______.

A.a difference in water pressure

B.the method of breaking up the water stream

C.the length of the applicator

D.All of the above

One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is

A.seal water supply be cut off

B.make-up water supply be cut off

C.oil outlet valve closed or not open sufficiently

D.the flow rate of oil is too much