單項選擇題During the dock repair, should be measured firstly before tail shaft drawn out（）

A.the sinking of tail shaft
B.the clearance of stern bearing
C.the total flexure of shaft
D.main engine crankshaft deflection


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2.單項選擇題A is the documentary attestation for the delivery of stores and spare parts（）

A.engine logbook
B.delivery docket
C.store booklet
D.maintenance book

4.單項選擇題When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be（）

A.disengaging the clutch firstly, then stopping the main engine
B.stopping the main engine firstly, then disengaging the clutch
C.stopping the cooling water pump firstly, then stopping the main engine
D.stopping the main engine and disengaging the clutch at the same time