单选题During the deck repair,（） should be measured firstly before tail shaft is drawn out.Athe sinking of tail shaftBthe clearance of stern bearingCthe total flexure of both end bearingDmain engine crankshaft deflection
单选题
During the deck repair,（） should be measured firstly before tail shaft is drawn out.
A
the sinking of tail shaft
B
the clearance of stern bearing
C
the total flexure of both end bearing
D
main engine crankshaft deflection
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