单项选择题

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.

A.Ring type
B.Fork type
C.Spade type
D.Push on pull off type

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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals

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For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

A.the temperature and flow quantity of the exhaust gas from M.E
B.the quantity of steam demanded
C.the rotary speed and the cooling water temperature of main engine
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A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

A.purge lube oil from the liquid refrigerant
B.recover water purged from the system
C.separate foul gases from the receiver
D.purge non-condensable gases without losing refrigerant