更多"In order to increase the wearing re"的相关试题:
[单项选择]In order to discharge a C02 portable fire extinguisher , the operator must first（）.
A. invert the CO extinguisher
B. squeeze the two trigger handles together
C. remove the locking pin
D. open the discharge valve
[单项选择]Metal particles accumulated from the wearing of components in a diesel engine can result from lube oil that has been contaminated with（）.
A. abrasive particles
B. metallic oxides
C. corrosive acids
D. any or all of the above
[单项选择]Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A. chromium plating piston rings
B. knurling the piston skirt
C. extended maximum power operation
D. applying load to a cold diesel engine
[单项选择]In order to determine the health hazard data for carbolic acid，you would use that information contained in the Chemical Data Guide for which chemical?（）
A. Acetic oxide
B. Carbinol
C. Carbon bisulfide
D. Phenol
[单项选择]The resistance of a conductor varies （）
A. directly as its length and inversely as its cross-sectional area
B. inversely as its length and directly as its cross-sectional area
C. directly as its length and directly as its cross-sectional area
D. inversely as its length and inversely as its cross-sectional area
[单项选择]Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）
A. Wrought iron can resist liquids flow
B. It is difficult to attain the wrought iron
C. Wrought iron should be combined with cuprous alloys
D. The cuprous alloys have mere disadvantages than wrought iron
[简答题]在排序子句中，排序依据列的前后顺序是否重要？ORDER BY C1，C2子句对数据的排序顺序是什么？
[单项选择]The purpose of the wearing rings used in a centrifugal pump is to （）.
A. prevent an internal explosion in the pump when it is overheated
B. enable a visual inspection of the pump while it is running
C. insure a proper alignment of the pump coupling to the driver
D. accommodate for friction between the impeller and the easing
[单项选择]What is the function of wearing rings found on some centrifugal pumps? （）
A. Absorb erosion of high velocity discharge stream
B. Seal pump shaft against entry of air
C. Isolate the outlet side from the inlet side
D. Dampen the turbulent discharge flow
[单项选择]With a purely resistance load the voltage and current are in phase, giving a power factor of （）.
A. one
B. less than one
C. more than one
D. negative one
[单项选择]The centre of lateral resistance is（）.
A. the center of the hydrodynamic forces acting on the underwater hull to resist the effect of the wind
B. the point of influence of wind on the ship
C. the pivot point
D. the point on the ship's above-water structure upon which the whole force of the wind can be considered an act
[单项选择]The resistance of electric wire will decrease as its （）
A. length increases
B. cross-sectional area increases
C. temperature increases
D. percent of metallic purities increases
[单项选择]The total resistance of a parallel circuit is always （）.
A. larger than the greatest branch resistance
B. smaller than the lowest branch resistance
C. equal to the sum of the individual branch resistances
D. one-half the sum of the individual branch resistances
[单项选择]An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an（）.
A. open circuit
B. short circuit
C. polarized ground
D. ground reference point
[单项选择]The unit of electrical resistance is the （）
A. ampere
B. volt
C. watt
D. ohm
[单项选择]Wearing seat belts in cars is（）by law.
A. commercial
B. compulsory
C. commanding
D. commentary
