Safety valves on a boiler vent to the （）.

A . over pressurization of the space being flooded B . rupture of cylinder due to temperature increase C . over pressurization of the CO discharge piping D . flooding of a space where personnel are present

A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

A . bypass exhaust gas at high loads to prevent excessive back pressure B . bypass a portion of the exhaust gas at peak loads for better efficiency C . recycle exhaust gas to the turbocharger D . minimize moisture condensation in the boiler gas passages at low load

A . tape face B . tapered face C . surface D . thinner face

A . burned exhaust valves B . excessive spring compression C . spring surge D . worn valve seat

A . superheat of the gas leaving the compressor B . back pressure in the evaporator C . temperature of the icebox D . superheat of the gas leaving the evaporator

A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

A . you are entering a space containing poisonous vapors B . you are entering a space containing explosive gases C . the regulator of the breathing apparatus malfunctions D . the face piece of the breathing device is too tight

A . free reception B . free transmission C . dedicated reception D . dedicated transmissio

A . maximum pressure allowed at that branch B . name of the space or spaces which it serves C . date of the last maintenance inspection D . pressure needed to maintain an effective stream at that point

A . erosion and cratering of the nozzle orifices B . fuel leakage into the nozzle drain line C . fuel leakage before and after injection D . insufficient fuel delivery though that nozzle

A . 正确 B . 错误

A . release CO to the protected space B . secure all mechanical ventilation in the protected space C . sound the rig's general alarm signal for a fire D . sound an alarm in the ballast control room

A . furnace to be re-purged B . electric charge to buildup in the igniter C . fuel pump to restart D . dram level to stabilize

A . be jammed B . be opened C . be seated D . be broke

A . A、安全卡瓦 B . B、安全阀 C . C、安全接头 D . D、安全开关

A . overhead safety straps B . built in seats C . internal releasing hooks D . water stabilizing pocket

A . completely drain the boiler in an emergency B . prevent sludge from forming in the drum C . remove floating impurities from the boiler water surface D . remove settled solids from the water drum

A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

A . tightened up B . sealed up C . opened up D . unscrewed

A . relieve excess fuel oil pressure during the “off” fire cycle B . admit water to the dry pipe C . throttle the forced draft fan output for proper combustion D . reduce excess steam pressure in the boiler

A . furnace to be re-purged B . electric charge to buildup in the igniter C . fuel pump to restart D . drum level to stabilize

What does "in-flight service" (Line 1, Para, ) mean？ A．Service on the plane. B．A new safety device. C．Flights within one country. D．Charge-free air service.

A、When one is an adult and one is a child under 3 years of age. B、Only during the en route flight. C、During all operations except the takeoff and landing portion of a flight.