Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）

A . Develop ductility B . Improve machining qualities C . Relieves stresses D . All of the above

A . arise B . rise C . arouse D . raise

A . Dehydrators must be used continuously in a refrigeration system B . A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours C . A thermostatic expansion valve is used to control refrigerated space temperature D . The liquid receiver functions to collect and remove non- condensable gase

A . Classes A and B B . Classes B and C C . Classes C and D D . Classes A and D

A . The fuel metering will vary B . The fuel will explode C . The cylinder head will crack D . The engine will sto

A . Expansion valve B . Condenser C . Evaporator D . Compressor

A . Overcoming sliding friction B . Overcoming rolling friction C . Overcoming fluid friction D . Overcoming oil wedge frictio

A . Hydraulic oil B . Lubricating oil C . Diesel oil D . Refrigeration oil

A . Individual statements in a named access list may be deleted. B . They require a numbered range from 1000 to 1099. C . When created, they must be specified as standard or extended. D . They are created with the ip access-list command. E . The entire access list must be deleted before editing. F . They are applied with the ip name-group command.

A . They should always be started with the discharge valve closed B . They should always be started with the discharge valve opened C . A priming pump is always required to flood the impeller suction D . They should always be started with the sealing line valves closed

A . Constant tension mooring winch system B . Hatch cover system C . Watertight door system D . Internal combustion engine hydraulic starter system

A . Piston wrist pin bushing B . turbine bearing C . Spring bearing D . Diesel engine main bearing

A . Expansion valve B . Evaporator C . Drier D . Receiver

A . cold fuel oil B . low fuel oil pressure C . low atomizing steam pressure D . water in the fuel oil

A . Proper refrigerant charge B . Faulty expansion valve C . Insufficient refrigerant D . Solenoid valve stuck ope

A . Production of high salinity distillate B . Seawater feed temperature below 165℃ C . A leak in the first stage demister D . A cracked distillate pump vent line

A . Lubrication B . Cooling C . Fuel D . Electric ignitio

A . lsvg -p datavg B . lsvg -l datavg C . lsvg -L datavg D . lsvg -o datavg

A . A power end and fluid end B . A propeller and educator C . A volute and impeller D . A turbine and pisto

A . You can delete individual statements in a named access list B . Named access lists require a numbered range from 1000 to 1099. C . Named access lists must be specified as standard or extended. D . You can use the ip access-list command to create named access lists. E . You cannot delete individual statements in a named access list. F . You can use the ip name-group command to apply named access lists.

A．A.Itsaves costs and reduces travel tim B．B.Itimproves motivation and productivity. C．C.It better balances work and family lif D．D.How to manage teleworkers and evaluate their performance is still a problem.

A．France B．America C．New Zealand D．India

A．improvement B．nothing C．paperwork D．proposal