Ullages on tankers are measured from（）.

A . prevent the generation of flammable or combustible gas in tanks B . blow out cargo lines to prevent the build up of gas concentrations C . dilute tank atmospheres to keep gas concentrations below the lower explosive limit D . prevent fires in the pumproom by continually displacing flammable vapor

A . a tug comes alongside while the tanker is loading grade D and E cargoes B . a large，fresh oil spill is discovered immediately adjacent to the side of the tanker C . there is an electrical storm in the vicinity D . there is a fire on the dock or on a nearby vessel

A . Provides for faster loading B . Lowers oxygen content in the tank C . Provides better fuel economy D . All of the above

A . Manning requirements B . Minimum freeboard permitted C . Grade(s) of cargoes that the vessel may carry D . Waters upon which the vessel may be operated

A . All of these cargoes are mutually incompatible B . Glycerine may be stowed adjacent to methyl acrylate but must be segregated from ethanolamine C . Methyl acrylate and ethanolamine are compatible but both must be segregated from glycerine D . Glycerine is compatible with both of the other cargoe

A . the pump discharge B . the manifold connection C . each fire station discharge D . the pump statio

A . You must have two toxic vapor detectors or the pumproom must meet special requirements B . Each crew member must be provided with an emergency escape breathing apparatus C . A person taking cargo samples must wear protective clothing D . If you are also carrying allyl alcohol，the venting systems must be segregated

A . Each of the cargoes must be segregated from the other by at least two barriers B . The minimum protective clothing required for taking samples of phosphoric acid is goggles or a face shield C . Aluminum，copper，and zinc are prohibited in all valve parts in contact with these cargoes D . The required warning sign must have the legend "cancer hazard" added to it

A . All of these cargoes are mutually compatible B . Benzene may not be carried in a tank adjacent to either of the other two cargoes C . Allyl alcohol is incompatible with propanolamine but both are compatible with benzene D . Propanolamine is compatible with allyl alcohol but must be segregated from benzene

A . You must have two toxic vapor detectors or the pumproom must meet special requirements B . Each crew member must be provided with an emergency escape breathing apparatus C . A person taking cargo samples must wear protective clothing D . If you are carrying propionic acid also，the venting systems must be segregated

A . Methyl acrylate may be loaded in a tank adjacent to diethanolamine but not triethylamine B . The heating coils to the cargo tank loaded with methyl acrylate must be blanked off C . Valve components made of aluminum，copper，or zinc may not be in contact with the cargoes D . Each crew member working on deck must have an emergency escape breathing apparatu

A . Master and Second Mate B . Master and Chief Engineer C . Master and union delegate D . Master and Chief Mate

You are on a tanker discharging oil．When all of the oil that the main cargo pumps can handle is pumped out of a tank，the remainder is ______． A.Stripped out and pumped directly ashore into the mainline as the remaining cargo tanks are pumped out with the main pumps B.Stripped to one tank and then pumped out with the main pumps C.Stripped out and pumped directly ashore after all the tanks have been emptied by the main pumps D.Gravitated to the centers from the wings and pumped out with the main pumps