直肠 * * 瘘的治疗以下不正确的是（）

A.术前有充分的肠道准备，手术中损伤直肠应立即修补

B.先天性粪瘘应积极术前准备后尽早手术治疗

C.先天性粪瘘应待患者15岁左右月经来潮后再行手术

D.压迫坏死性粪瘘，应待3～6个月后再行修补

E.术前严格肠道准备

An internet is a combination of networks connected by (1).When a datagram goes from a source to a(2)，it will probably pass many (3)until it reaches the router attached to the destination network. A router receives a (4)from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5)is the optimum pathway?

空白（1）处应选择（）

A.modems

B.routers

C.switches

D.computers