单选题The humidifier’s valve of air-conditioner should be (), when the temperature is 5~8°C in the winter.AdecreasedBincreasedCfixedDclosed

单选题
The humidifier’s valve of air-conditioner should be (), when the temperature is 5~8°C in the winter.
A

decreased

B

increased

C

fixed

D

closed


参考解析

解析: 暂无解析

相关考题:

If the head pressure of a reciprocating refrigeration compressor is excessiveA.the relief valve should open before the high pressure cutoutB.the relief valve should open and allow the excess refrigerant to flow to the receiverC.the high pressure cutout switch should operate before the relief valve opensD.you should close the discharging valve

To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .A.suction service valve as a vaporB.suction service valve as a liquidC.discharge service valve as a vaporD.charging valve as a liquid

When loading bulk liquid cargo,what is the first action you should take if a cargo valve jammed open?A.Call the owner,operator,or terminal supervisorB.Unplug the deck scuppersC.Order the dock man to shut downD.Run out the vessel's or terminal's fire hose

To ensure proper seating when closing a valve on a tank,the valve should be ______.A.Set up as tight as possible by handB.Set up tight using a valve wrenchC.Closed,opened a half turn,and then closedD.Closed against the stop and the locking pin inserted

Which two statements describe the behavior of the server's SQL mode?()A、The server's SQL mode determines how the server should behave when performing data validation check and interpreting different forms of syntaxB、The server's SQL mode determines whether the server should be read-only or should accept commands such as INSERT and UPDATEC、The server's SQL mode can be changed at the session level with a SET SESSION sql_mode="new_value" commandD、The server's SQL mode, when globally set on a slave server, applies to events sent from the master

单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because().Aa subsequent temperature rise will cause the cargo to overflowBair pockets may cause the cargo to bubble out of the ullage holeCthe increased viscosity of the product requires higher loading pressure which increases the chances of a spillDthe tank valve may be stiff and a spill will occur before the valve can be closed

单选题When operating the air supply system in a covered lifeboat the().Afuel supply valve should be closedBhatches,doors,and oar ports should be closedCair cylinder shut-off valve should be closedDengine should be shut off

单选题When the order () is received from the bridge, the main air stop valve in the starting air line should be shut.Astand-by engineBfull aheadCfinished with engineDfull away

单选题The needle valve in a fuel valve will () when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.Abe jammedBbe openedCbe seatedDbe broken

单选题The period of valve overlap is when ().Athe inlet valve is openBthe exhaust valve is openCboth valves are closeDboth valves are open

单选题The humidifier’s valve of air-condition should be (), when the temperature is lower than 0℃.AdecreasedBincreasedCfixedDclosed

单选题When loading bulk liquid cargo,what is the FIRST action you should take if a cargo valve jammed open?()ATrip the pump relief valveBOrder the dock man to shut downCCall the owner,operator,or terminal supervisorDRun out the vessel's or terminal's fire hose

单选题When loading bulk liquid cargo,what is the first action you should take if a cargo valve jammed open?()ACall the owner,operator,or terminal supervisorBUnplug the deck scuppersCOrder the dock man to shut downDRun out the vessel's or terminal's fire hose

单选题If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the()Arack position should be adjustedBcompensating needle valve should be opened fully compensatingCneedle valve should be adjusted to stabilize operationDspeed limiting device should be adjusted

单选题If the head pressure of a reciprocating refrigeration compressor is excessive, ().Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve

单选题When ship in the dock repairing, engine department should emphasize on the inspection of()Asea valve chest, sect valve, thrusterBbilge motherboard, steering and the shaft systemCsea water systemDfresh water system

单选题If the head pressure is too high,()Athe relief valve should open before the high-pressure cutoutBthe relief valve should open and let excess refrigerant go to receiverCthe high-pressure cutout switch should operate before the relief valve opensDclose in on the suction valve

单选题In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a ().Apositive headBnegative suction headCmechanical sealDvent valve attached to the casing at the top of the volute

单选题After fuel tanks have been topped off, which of the listed procedures should be followed next?()AThe pressure-vacuum relief valve should be resetBThe tanks should be made seaworthy to prevent contaminationCThe tanks should be sounded to make sure the levels are not risingDThe tanks should be marked with a bull stamp on the manifold filling valve

单选题To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the ()Asuction service valve as a vaporBsuction service valve as a liquidCdischarge service valve as a vaporDcharging valve as a liquid

单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the ().Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor

单选题If in doubt as to the true water level when a boiler is being oil-fired, you should ().Atake no measuresBextinguish the fire as soon as possibleCfeed water to the boilerDopen the blow down valve

单选题When starting a centrifugal pump, the discharge valve should be ().AclosedBopened fullyCcracked openDpartly open

单选题An interlock in the remote operating valve line stops the valve () when the engine turning gear is engaged.Ato openBopeningCopenDopened

单选题The air-conditioner is running in the winter and to be stopped, we should()Aclose Fan and Humidifier at the same timeBfirstly close Fan and then close humidifier immediatelyCfirstly close humidifier and then close Fan immediatelyDfirstly close humidifier and then close Fan after 30 seconds

单选题When a refrigeration compressor motor fails to start, the FIRST thing that should be checked for is a ().Aloose expansion valve control bulbBlow differential setting on the H-PcutoutCblown fuse in the motor circuitDfaulty suction pressure regulator

单选题When starting air-conditioner in the winter, we should open()in sequence. Ⅰ.alve of warming Ⅱ.alve of humidifier Ⅲ.anAⅢ-Ⅱ-ⅠBⅢ-Ⅰ-ⅡCⅠ-Ⅲ-ⅡDⅡ-Ⅲ-Ⅰ