单项选择题
A strong back refers to a（）.
A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay
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A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
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单项选择题
A spark arrestor（）.
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
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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
