The processes of surface engineering, or surface treatments, tailor the surfaces of e

相似题目

• Which of the listed cylinder liner surface conditions indicates proper lubrication?（）

  A . Dull black appearance B . Bright appearance C . Thin layer of lacquer D . Thick oily film

  查看最佳答案

• The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）

  A、oxygenating B、oxidizing C、deoxygenating D、proportioning

  查看最佳答案

• The rising velocity of the globules carries them upwards where they become trapped by the under surfaces of plates and （）until the enlarged globules have sufficient rising velocity to travel along the plate surface and break away at periphery.

  A . A.disperse B . B.coalesce C . C.compress D . D.shrinkage

  查看最佳答案

• When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing

  A . (1) only B . (2) only C . (1) and (2) D . (1), (2) and (3)

  查看最佳答案

• Swell is the rise and fall of the ocean’s surface due to（）.

  A . fetch B . distant winds C . local storms D . the pull of the moo

  查看最佳答案

• The use of sinking and dispersing chemical agents for removal of surface oil is（）.

  A . the most common method used in the United States B . too expensive for common use C . generally safe to sea life D . authorized only with prior approval of the Federal On-Scene Coordinator

  查看最佳答案

• Increasing free surfaces has the effect of raising the（）.

  A . uncorrected KG B . virtual height of the center of gravity C . metacenter D . metacentric height

  查看最佳答案

• The effect of free surface on initial stability depends upon（）.

  A . the amount of liquid in the compartment B . the dimensions of the liquid surface and the vessel's displacement C . only the length of the compartment D . the vertical position of the liquid in the vessel

  查看最佳答案

• Which of the following is more important in determining the amount of free surface that will be produced?（）.

  A . Outside temperature B . Dewpoint of the outside air C . Dewpoint of the air in the cargo hold D . Temperature of the carg

  查看最佳答案

• The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.

  A . mean high water B . mean low water C . half-tide level D . mean sea level

  查看最佳答案

• Some radio waves（）the surface of the earth because of its（）.

  A . are capable of following / distance B . can follow / altitude C . can hardly follow / shape D . are unable following / angle

  查看最佳答案

• The direction of the surface wind is（）.

  A . directly from high pressure toward low pressure B . directly from low pressure toward high pressure C . from high pressure toward low pressure deflected by the earth's rotation D . from low pressure toward high pressure deflected by the earth's rotatio

  查看最佳答案

• The use of sinking and dispersing agents for the removal of surface oil is （）.

  A . the most common method used in the United States B . too expensive for common use C . generally safe to sea life D . generally harmful to sea life

  查看最佳答案

• The extended aeration process consists of （） the liquor either by bubbling air through it or by agitating the surface.

  A . A.deoxygenating B . B.oxygenating C . C.chemicalizing D . D.disinfecting

  查看最佳答案

• The distance between the surface of the water and the tidal datum is the （）.

  A . range of tide B . height of tide C . charted depth D . actual water depth

  查看最佳答案

• Machining is the manufacturing process in which the size, shape, or surface properties of a part are changed by removing the excess material.

  查看最佳答案

• Why does the surface of the brain contain folds?

  查看最佳答案

• Which of posterior mediastinal structures is most closely applied to the posterior surface of the pericardial sac?

  查看最佳答案

• 129. The average height of the surface of the sea for all stages of the tide over a 19 year period is called _____.

  查看最佳答案

• Moisture absorbed in the winding or condensed on the surface of electrical machinery nsulation

  A.is good for long term preserving since most insulation is organic and contains some amount B.lowers the insulation value and is a common cause of fault grounds in idle machines C.will enhance insulation resistance only if it is no salt D.reduces the amount of current supplied or drawn by the machine so horsepower is limited

  查看最佳答案

• Black areas on the sealing surfaces of piston rings indicate＿.

  A.lube oil pumping B.rotating rings C.gas pressure behind the ring D.passage of hot gases

  查看最佳答案

• The distance between the surface of the water and the tidal datum is the______．

  A.height of tide B.charted depth C.actual water depth D.range of tide

  查看最佳答案

• Which of the following is NOT true about the "blueberries" on the surface of Mars？

  A．They were scattered everywhere on the top of the rock. B．They were scattered here and there through the rock. C．They may have been formed by minerals that accreted in water. D．They are actually the size of BB spherules.

  查看最佳答案

• How much of the earth's surface does land cover？

  A．15% B．25% C．30% D．45%

  查看最佳答案