sudden evaporation of wax crystals in the lubricant
sudden evaporation of entrapped air in the lubricant
release of refrigerant from the oil/refrigerant mixture
release of dissolved lubricant from the refrigerant
单选题The text supplies information to answer which of the following questions?A How does the reduction of space affect intragroup aggression among monkeys in an experimental setting?B Do family units within a monkey social group compete with other family units for food?C What are the mechanisms by which the social order of an established group of monkeys controls aggression within that group?D How do monkeys engaged in aggression with other monkeys signal submission?
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名词解释题撞击声压级改善量reduction of impact sound pressure level
单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）A engine overloadB leaky valvesC stuck or broken piston ringsD low air injection pressure
单选题Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.A Expect to see cirrus clouds followed by altostratus and nimbostratus cloudsB Alter course to remain in the navigable semicircleC Prepare for gusty winds，thunderstorms，and a sudden wind shiftD Expect clear weather，with steady winds and pressure，until the front passes
单选题The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.A startersB pressure switchesC pressureD water
单选题A sudden drop in diesel engine cylinder compression pressure can be caused by（）A a leaking fuel injector nozzleB a clogged air filterC excessively early fuel injectionD malfunctioning valves
单选题When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）A rise quicklyB rise slowlyC drop quicklyD drop slowly
