During the dock repair, when installing the tail shaft and propeller, _____ should be on t

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

A.chief engineer

B.engineer

C.captain

D.any member of the engine department

材料：

The Port of London comprises the 147km of the tidal River Thames，and the enclosed dock system at Tilbury．The limits of the port are from Teddington to those territorial waters within a limit as follows：from Foulness Point（Essex）to Gunfleet old lighthouse to 51°26′36′′N，01°25′30′′E to Warden Point（Kent），excluded is any part of the port as defined in the Medway Ports Reorganisation Scheme 1968；River Lea or Bow Creek within the jurisdiction of the British Waterways Board；The Grand Union Canal and Regents Canal Dock．For London District River Pilots the upper limit is London Bridge and the down river limit is just below Gravesend.

For the London District Sea Pilots the upriver limit is an imaginary line from the Sealink ferry pier at Gravesend to Tilbury Passenger Landing Stage and the lower limit is a line running from Felixstowe across the mouth of the Thames outside the GOODwin Sands to Folkestone．

The Thames Barrier，built for the Greater London Council at Woolwich Reach to afford protection against tidal floods is now under control of the Thames Water Authority．It allows shipping to and from the upper areas of the Port of London to pass without restriction during periods of non-surge conditions．

Spanning 520m across the river，it comprises ten rising sector gates，of which four main gates for navigation have a width of 61m and two subsidiary gates have a width of 35m．

问题：

________ does not belong to the Port of London．

A.River Lea or Bow Creek within the jurisdiction of the British Waterways Board

B.The Grand Union Canal and Regents Canal Dock

C.from Foulness Point（Essex）to Gunfleet old lighthouse to 51°26′36′′N，01°25′30′′E to Warden Point（Kent）

D.any part of the port as defined in the Medway Ports Reorganisation Scheme 1968

For the London District Sea Pilots the upriver limit is ________．A.London Bridge

B.just below Gravesend

C.an imaginary line from the Sealink ferry pier at Gravesend to Tilbury Passenger Landing Stage

D.a line running from Felixstowe across the mouth of the Thames outside the GOODwin Sands to Folkestone

________ is spanning 520m across the river，comprising ten rising sector gates，of which four main gates for navigation have a width of 61m and two subsidiary gates have a width of 35m．A.The Thames Barrier

B.Felixstowe across the mouth of the Thames

C.Woolwich Reach

D.Thames Water

This passage is most likely extracted from ________．A.Guide to Port Entry

B.Notices to Mariners

C.Attachment to a Charter Party

D.Ocean Passage

请帮忙给出每个问题的正确答案和分析，谢谢！

A.系统预置(SystemPreferencE.程序中的Dock预置面板

B.“苹果”菜单下的“Dock”子菜单

C.“文件”菜单下的“Dock”子菜单

D.Dock应用程序

E.都不可以

A.Locked

B.Padding

C.Dock

D.TextAlign