A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
1、The oil （） in the discharging water fr
The oil （） in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.AfilterBholeCpollutionDcontent
2、A decrease in barometric pressure is a
A decrease in barometric pressure is associated with all of the following except（）.Arising warm airBproximity to a low pressure areaCinward spiraling circulationDclear dry weather
3、A slow，gradual fall of the barometer i
A slow，gradual fall of the barometer indicates approaching（）.Agale force winds within 12 hoursBblizzard conditionsCdeteriorating or unsettled weatherDheavy，wind driven rai
4、The word "discharge" as used in Pollut
The word "discharge" as used in Pollution Prevention Regulations applies to oil （）.Aleaked into navigable watersBpoured into navigable watersCpumped into navigable waters through a fixed piping systemDall of the above
5、A decrease in the flash point of diese
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.Acontaminated with sludgeBcontaminated with carbonCdiluted with fuel oilDdiluted with water
6、In （） pumps a closed discharge valve w
In （） pumps a closed discharge valve will cause bursting discharge pressure.AcentrifugalBplungerCinjectorDwater