单项选择题
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
A single fitting installed in a pipeline that either bl...
单项选择题A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.
A.blind flange B.pivot coupling C.quick-release coupling D.spectacle flange
A ship crane which has been idle for a period of over s...
单项选择题A ship crane which has been idle for a period of over six months shall be inspected to the same standards as a（）.
A.yearly inspection B.quarterly inspection C.monthly inspection D.weekly inspection
A sheepshank is used to（）.A.keep a line from frayingB.j...
单项选择题A sheepshank is used to（）.
A.keep a line from fraying B.join lines of unequal size C.stop off a line D.shorten a line
