A--answer phone
B--burglar alarm
C--date-stamp
D--electronic display material
E--headed paper
F--office information system
G--shorthand
H--annual report
I--registered delivery
J--office automation
K--time sheet
L--computer package
M--handbook
N--waste basket
O--card-index
P--blueprint

（）印有信头的信纸（）录音电话

A--answer phone
B--burglar alarm
C--date-stamp
D--electronic display material
E--headed paper
F--office information system
G--shorthand
H--annual report
I--registered delivery
J--office automation
K--time sheet
L--computer package
M--handbook
N--waste basket
O--card-index
P--blueprint