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