3000×310×59,
=900×59,
=500(本);
答:文艺书有500本.
The girl had to ____the college entrance exam because of her maother’illness.
A.leave
B.abandon
C.desert
D.pause
若路由器R因为拥塞丢弃IP分组,则此时R可向发出该IP分组的源主机发送的ICMP报文的类型是()。
A.路由重定向
B.目标不可到达
C.源抑制
D.超时