A.string B.stand C.joint D.standpipe
A.swivel B.cathead spool C.drawworks D.stand pipe
A.once each crankshaft revolution B.twice each crankshaft revolution C.every other crankshaft revolution D.every fourth stroke
A.a defective ignition system B.low lube oil level C.weak valve springs D.too heavy a load
A.flow of petroleum through pipes B.spraying or splashing of petroleum C.settling of solids or water in petroleum D.All of the above
A.you are entering a space containing poisonous vapors B.you are entering a space containing explosive gases C.the regulator of the breathing apparatus malfunctions D.the face piece of the breathing device is too tight
A.crow bar B.device to force a water tight door against the frame C.heavy steel beam D.wedge
A.break glass，pull valve，break glass，pull cylinder control B.sound evacuation alarm，pull handle C.open bypass valve，break glass，pull handle D.open stop valve，open control valve，trip alarm
A.Globe valve B.Butterfly valve C.Gate valve D.Packless valve
A.bilge water may enter the exhaust pipe B.entry of air may cause vapor lock C.carbon monoxide may enter the interior of the vessel D.the joint gaskets may be blown
