is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group。

A．SMTP

B．ICMP

C．MIME

D．IGMP

[单选题] (66) is a protocol that a host uses to inform. a router when it joins or leaves anInternet multicast group.(67) is an error detection code that most data conlmunication networks use.(68) is an interior gateway protocol that uses a distance vector al

[名词解释] 终宿主(final host or definitive host)

[单选题]The underlined word“inform”in Paragraph 2 probably means“ ”.A．affectB．changeC．disturbD．reject

[单选题]D．irections According to the given information,you are required to write A Letter to a Friend in about 1OO words. The letter is required to be written on the Answer Sheet.情景：假定你是北京大学计算机专业新生赵华，入学几个月后，给朋友李玲写一份信。收信人地址：安徽省合肥市芙蓉路 632 号（邮编：230601）要求：按照完整英文

[单选题]The bridge should inform the engine room______before passing through congested or shallow waterway.A．24 hoursB．2 hoursC．1 hourD．15 minutes

[单选题]Please inform us ____ the supply and demand situation in your country.A . toB . ofC . withD . in

[单选题]We are pleased to inform.you that the item you requested can be supplied（）stock.A . uponB . outC . inD . from

[名词解释] Protocol协议

[名词解释] Host Link

[名词解释] 宿主（host）