单选题The cheek length of a block in inches should be about（）.A three times the circumference of a manila lineB five times the diameter of a manila lineC twice the diameter of its sheaves for manila lineD twenty times the diameter of a manila line

材料：

A block may not only indicate the insertion of new information，but also the omission of matter previously shown．The text of the Notice should invariably be read carefully．The limiting lines of a block are determined for convenience of reproduction．They need not be strictly adhered to when cutting out for pasting on the chart，provided that the preceding paragraph is taken into consideration．Owing to distortion the bocks do not always fit the chart exactly．When pasting a block on a chart，therefore，care should be taken that the more important navigational features fit as closely as possible．This is best done by fitting the block while it is dry and making two or three pencil ticks round the edges for use as fitting marks after the paste is applied to the chart．

问题：

DISTORTION means that ______．

A.the change in form of the block

B.extract of in form of the block

C.the extension in form of the block

D.the increasing of the data in the block

When cutting out and pasting the block care should be used to ensure that ______．A.it be dry enough

B.pencil should be used properly

C.the limits are adhered strictly

D.the more important navigational features fit as closely as possible

The block is not used to ______ ．A.show omissions

B.provide new information

C.make corrections to the Notice

D.change the shape of the charts

The block should be ______ on the chart．A.pasted

B.drawn by pencil

C.fitted

D.put

请帮忙给出每个问题的正确答案和分析，谢谢！

How is the size of chain determined?______.

A.Length of link in inches

B.Diameter of metal in link in inches or centimeters

C.Links per fathom

D.Weight of stud cable in pounds

If you want to learn about Anderson's col鄄lection,you should click on .

A.list by rating B.list by author

C.list by length D.list by date added

When backing down with sternway，the pivot point of a vessel is ______.

A.about one-quarter of the vessel's length from the stern

B.at the bow

C.about one-third of the vessel's length from the bow

D.aft of the propellers

According to the author, the reason why we go wrong about our friends is that ______.

A)we fall to listen carefully when they talk

B)people tend to be annoyed when we cheek what they say

C) people usually state one thing hut means another

D)we tend to doubt what our friends say