(一) 每一段的第一行都从左边空白边缘往右缩进3——5个字母的位置;
缩行式信函的`特点：
1） 头和封内地址每逢换行时，下一行要比上一行往右缩进2——3个字母的位置；
2） 期放在信纸的右上端，签名放在中间偏右下方；
3） 每一段的第一行都从左边空白边缘往右缩进3——5个字母的位置；
4） 段落之间要空1——2行。
信1
messrs。 william & sons
58 lancastor house
manchester， england
march 20， 1999
our ref。 no。
your ref。 no。
the national transport co。
120 broadway street
rangoon， burma
dear sirs，
re: lab instruments
your firm has been recommended to us by messrs。 charles evans ltd。， birmingham， with whom we have done some business for the past two years。
we are thinking of getting a supply of instruments。 please furnish us with a catalogue， price list and brochure， if available。
we are looking forward to your early reply。
yours faithfully，
(二)齐头式或平头式(block style)
齐头式信函的特点：
每一行，包括日期和签名等都从左边开始，每行取齐，成一垂直线。
信2
el mar trading company
16 main street
fresno， california
u。s。a
tel:123456
cable address: elmar fresno
8 january，1999
gentlemen，
we thank you for your letter of january 1。 as requested， we enclose the catalogues for your reference。
we would be very glad to offer any further assistance。 please contact us if you need any additional information。
yours sincerely
encl : as stated
(三)混合式 ( semiblock style with indented paragraphs)
混合式信函的特点:
1) 正文的每一段落的第一行采用缩行式;
2)除信头和日期外，其他部分采用齐头式。
信3
office of the attorney
aaa company
123 main street
centerville， il666
u。 s。 a。
april 21， 1999
president， billboard inc。
999 broadway
metropolis， ny2222
dear sir:
we value your long-term relationship with us。
a review of your account shows that some time has passed since you last made payment to us。 if there is some difficulty you are facing that is causing this， we would like the opportunity of working matters out with you。 if there is the result of oversight， we would appreciate early remittance。
we look forward to hearing from you in the near future。
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