F．or a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _______.

A．bowl periphery

B．bowl center

C．upper surface

D．lower surface

[单选题]In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.A . bowl peripheryB . bowl centerC . upper surfaceD . lower surface

[单选题]In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.A . the outlet of oilB . the outlet of waterC . the bowl peripheryD . the center of bowl

[问答题]American cities are changing, just as American society is changing.

[单选题]Sediment collects in a tubular purifier （）.A . on top coverB . on sides of bowlC . in drain line on the discsD . on the disc

[单选题]To ensure oil purifier working in normal condition, the interval between two sludge discharging should not exceed_______hours.A．2B．4C．5D．6

[主观题]what is the use of a purifier ?explain the purpose of a gravity disc ?

[单选题]It can be interred that without gravity .A．buildings and other structures would float awayB．trees and buildings would not so easily fly offC．something around your head would not float awayD．everything outside buildings would fly off into space

[单选题]If the vertical center of gravity (VCG) of a ship rises 1.7 feet，the righting arm (GZ) for the various angles of inclination will（）.A . decreaseB . increaseC . remain unchangedD . be changed by the amount of GG' x cosine of the angle

[单选题]The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.A . waterB . oilC . scaleD . ridge

[单选题]Changing an accounting estimate:A.Is reported prospectively.B.Requires rest