Before replacing a piston you should c

1、Before you start an engine in a compar

Before you start an engine in a compartment，it’s MOST important to（）.Acheck the flame arresterBcheck the fuel tankCcheck the batteryDventilate the bilge

2、During a period of whiteout，you should

During a period of whiteout，you should expect which of the following（）.ASnowfall or blowing snowBLack of ability to estimate distanceCHarsh contrast between sun-illuminated snow cover and the backgroundDHazy horizons with extensive mirage effect

3、You should conduct a sector search und

You should conduct a sector search under which of the following circumstances（）.AThe search target is sighted and then lostBMore than one vess...

4、When underway in a channel,you should

When underway in a channel,you should keep to the（）.Amiddle of the channelBstarboard side of the channelCport side of the channelDside of the channel that has the widest tur

5、To anneal a copper gasket, you should

To anneal a copper gasket, you should heat the gasket（）Aand quench it in oilBcherry red and quench in waterCand let it cool slowly in the airDand carbonize

6、When should you conduct a visual inspe

When should you conduct a visual inspection of your towline? （）AWhenever its serviceability is in doubtBIn accordance with the manufacturer's recommendationCAt least once a monthDAll of the above