A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）
1、As for a hydraulic vane pump, which o
As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （）(1)the rotor(2)the pump shaft(3)the external surface of the housingA(1) onlyB(2) onlyC(1) and (2)D(1),(2)and(3)
2、In a diesel engine cooling water syste
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.Aslightly acidic conditionBslightly alkaline conditionCovertreatment of waterDneutral condition of water
3、In a hydraulic system, （） are used to
In a hydraulic system, （） are used to protect the system from over pressure.Astop valvesBcheck valvesCsafety valvesDreducing valve
4、A re-heater, as used in an air conditi
A re-heater, as used in an air conditioning system, is designed to control the （）Achilled water temperatureBdew point temperatureCprimary air temperatureDdry bulb temperature
5、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
6、As used in this passage, "structures"
As used in this passage, "structures" means ______.A enduranceB organizationC necessary partsD energy