某六层砖混结构住宅楼，每层结构外围水平面积800m2，每层封闭阳台的水平投影面积20m2，底层

Which of the listed problems could produce a high absolute pressure within a flash type evaporator？

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

Which of the problems listed could cause erosion of the expansion valve disks and seats？

A.Overcharging the system with refrigerant

B.Faulty compressor suction valve

C.Failure of the high pressure cutout

D.Flash gas formed in the liquid line

A.CO2

B.Methyl chloride

C.R-22

D.Sulphur dioxide

A.Proper refrigerant charge

B.Faulty expansion valve

C.Insufficient refrigerant

D.Solenoid valve stuck open

A.cold fuel oil

B.low fuel oil pressure

C.low atomizing steam pressure

D.water in the fuel oil

When a fuel injection nozzle overheats, which of the problems listed can be expected？

A.The fuel metering will vary

B.The fuel will explode

C.The cylinder head will crack

D.The engine will stop

In almost 1400 B.C. new smelting techniques led to the high __3__temperatures which could produce an iron superior in strength to bronze.

Which of the listed devices could be used as a substitute for a ring grooving tool？

A.Steel brush

B.Fine emery cloth or steel wool

C.A section of the removed compression ring

D.A case hardened scraper

Which of the listed set of conditions indicates early fuel injection timing？

A.Loss of engine power and high exhaust temperatures

B.Higher than normal firing pressure and low exhaust temperatures

C.High fuel consumption and high exhaust temperatures

D.Lower than normal compression pressure and high exhaust temperature

A．Oospores

B．Zygospores

C．Ascospores

D．Basidiospores