The air is （）(有毒的).A、humidB、dampC、toxicD、mould
The air is （）(有毒的).
- A、humid
- B、damp
- C、toxic
- D、mould
相关考题：
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单选题Air blowing from the intake air filter of an operating air compressor indicates （）.Abroken inlet valvesBbroken discharge valvesCpulsations in the air distribution systemDoverloading of the air distribution system
单选题Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.Apressure changes in the air massBmovement of the air massCthe heterogeneous nature of the air massDupper level atmospheric changes
单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）AHolding the valve open for a long periodBIncreasing the starting air pressure usedCOpening the stating air valve quicklyDReducing the starting air valve size
单选题Cumulonimbus clouds are formed by（）.Avertical air movementsBheavy rainstormsChorizontal air movementsDany movement of moist air
单选题The engine will fail to start unless （）.Athe pressure of the starting air is high enoughBthere is enough air in the air reservoirsCthe air is supplied into the cylinders in the appropriate sequenceDall of the above
单选题Diesel engine air start system check valves are opened by （）Aan air start camBcylinder compression pressureCstarting air pressureDvalve springs
单选题（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.AAn air receiverBAn operating valveCAn automatic valveDAn air distributor
单选题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.Acombustion control air systemBsupply air systemCships service air systemDlow pressure deck air system
单选题Which condition indicates the air side fouling of an after-cooler on a turbocharged diesel engine?（）AAn increased air temperature differential between the cooler inlet and outletBA decrease in the air pressure differential across the coolerCExcessive condensate forming in the air boxDA decrease in the air temperature differential between the cooler inlet and outlet
单选题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.Aan auxiliary reservoirBa controlling air bottleCan emergency air compressorDa main air compressor
单选题（） supplies pilot air to control the cylinder air start valves.AAn air compressorBAn indicator cockCAn air distributorDA safety valve
单选题Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.AopenBcloseCdrainDvent
单选题Disastrous explosions have been caused by accumulations of oil or oil vapour in air lines not drainedAccording to the above sentence, which of the following statements is true?（）AOil vapour in air piping are dangerousBExplosion will cause oil vapouring in air linesCOil vapour in air piping should be drainedDOil in air piping should not be drained
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）Anoise coming from that air starting valveBcontinuous operation of the starting air compressorCzero air pressure in the air starting systemDoverheated starting air pipe to the cylinder head
单选题Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?（）ACooling the air to a temperature just above dew pointBHeating the air to a point at which moisture will boil off ,then re-cooling itCCooling the air to a point below dew point, then reheating itDHeating the air and then cooling it to a point below dew point
单选题Which of following functions is not one of the functions of air conditioner?（）Arefreshing the airBmaking person upsetCadjusting the air humidityDadjusting the air temperature
单选题If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.Acontrol air systemBforced draft air systemCsupply air systemDships service air system