A.familiar
B.understand
C.conversation
D.confused
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A.masters
B.chief engineers
C.crew
D.all personnel
A.communicate
B.verify
C.audit
D.evaluate
A.communicate
B.verify
C.audit
D.evaluate
A.should bring
B.should be brought
C.should take
D.should be taken
A.with
B.without
C.against
D.above
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