Expansion tank should be used to remove （） from cooling water.

[单选题]Head tank should be used to remove （） from cooling water.A . scaleB . sludgeC . chemicalsD . air

[单选题]The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A . reduce water temperatureB . reduce water turbulenceC . provide an air cushionD . allow for an increase in water volume as th

[单选题]The expansion valve used in a refrigeration system regulates theA．superheat of the gas leaving the compressorB．back pressure in the evaporatorC．temperature in the refrigerated spaceD．degree of superheat of the gas leaving the evaporator

[单选题]If diesel oil in this tank is used, the （） of the oil must not exceed 120 degree F.A . viscosityB . flash pointC . acid valueD . temperature

[单选题]Before being used the fuel service tank should be drained of （）.A . soda solutionB . mechanical impuritiesC . ballastD . water and residual

[单选题]What type of extinguisher should be used for an electric fire? ________A．CO2B．FormC．WaterD．Water and Form

[单选题]What kind of cable should be used to establish a trunked line between two Catalyst switches?A．A straight-through cableB．An EIA/TIA-232 serial cableC．An auxiliary cableD．A modem cableE．A cross-over cable

[单选题]What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）A . Sea anchorB . Steering oarC . Spare rudderD . Dagger board

[单选题]Which type of cable should be used to make a connection between the Fa0/0 port on a router and the Fa0/0 port switch?A．Rollover cableB．Console cableC．Crossover cableD．Straight-through cableE．Serial cable

[单选题]According to which business cycle theory should expansionary monetary polic