A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an engine's exhaust system
D.grounds static electricity
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A.blind flange
B.pivot coupling
C.quick-release coupling
D.spectacle flange
A.yearly inspection
B.quarterly inspection
C.monthly inspection
D.weekly inspection
A.keep a line from fraying
B.join lines of unequal size
C.stop off a line
D.shorten a line
A.positive correction
B.dip error
C.negative correction
D.semidiameter error
A.Restricted area
B.Closed area
C.Prohibited place
D.Forbidden place
最新試題
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Permission is kindly requested（）the ballast water.