学校今年有图书1566册,比原来增加了20%,图书室原有多少册图书?
1566÷(1+20%),
=1566÷120%,
=1305(册);
答:图书室原有1306册图书.
OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the ______ layer of the OSI model.
A.transport
B.application
C.network
D.physical
旅客输送日计划内容是什么?