Dirty oil must be （） before being used again.

[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]A dirty diesel engine oil filter element can best be detected by （）.A . visual inspection of the elementsB . the pressure drop across the filterC . high lube oil sump temperatureD . decrease in oil viscosity from the filter

[单选题]“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）A . by using of fresh waterB . with compressed airC . by using of sea waterD . with chemical compound

[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]The diesel engine must be started before it can run by it self For this purpose （） has to be used.A . a starting systemB . the starting airC . a starting operationD . A, B and C

[单选题]Must I be home before seven?_________。A.No, you needn'tB.No, you mustn'tC.Y

[单选题]C．DP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)A． To determine the status of network services on a remote deviceB． To obtain the IP Address of a connected dev

[单选题]If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur?（）A . A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the loadB . An electromagnetic brake will

[单选题]Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.A . the indicatorsB . the starting valvesC . the cylinder lubricatorsD . the turning gear

[单选题]（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.A . Except forB . BesideC . ExceptD . In addition to