一般而言，下列商品中哪一种需求价格弹性最大？（）

Admiralty Sailing Directions are Kept up to date by________.

A.corrections

B.publications

C.supplements

D.alterations

Admiralty Sailing Directions published in England are kept up to date by______．

A.corrections

B.publications

C.supplements

D.Alterations

Sailing directions are kept up to date by ______.

A.publications

B.notices to mariners

C.supplements

D.Annual Summary of Admiralty Notices to Mariners

Different liner use themselves sailing schedule, however general sailing schedule includes( ).

A. port of call B. sailing date C. arrived date D. volume

A、sailing directions are studied

B、study the sailing directions

C、to direct sailing studies

D、studies direct sailing

Every new supplement to the Sailing Directions ______ the previous on

A.enforces

B.cancels

C.corrects

D.replenishes

In Admiralty Sailing Directions，bands is the word used to indicate ______ marking．

A.horizontal

B.vertical

C.diagonal

D.vertical or diagonal

In Admiralty Sailing Directions，STRIPES is the word used to indicate ______ markin

A.horizontal

B.vertical

C.diagonal

D.vertical or diagonal

Admiralty Sailing Directions are written with the assumption that the reader ______．

A.is familiar with all information contained in UKHO publications

B.knows nothing about any sailing directions

C.is lack of particular knowledge concerning the navigation of the area

D.has the appropriate chart before him and other relevant publications to hand