For each blank, choose the best answer from the four choices and write down on the answer sheet.

In (1) the strength of the carrier signal is varied to represent binary 1 or 0. (2) is a system that can map a name to an address and conversely an address to an name. (3) is a three -way handshaking authentication protocol that it’s packets are encapsulated in the point - to -point protocol. (4) is an approach that enables an ATM Switch to behave like a LAN switch. (5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

4（）

A．VLAN

B．LANE

C．VPN

D．IPOA

按照煤矿企业核定(设计)或者采矿许可证确定的生产能力核定，其标准为______。

A．3万t以下(含3万t)存储60万～100万元

B．3万t以上至9万t(含9万t)存储150万～200万元

C．9万t以上至15万t(含15万t)存储250万～300万元

D．15万t以上，以300万元为基数，每增加10万t增加40万元

E．15万t以上，以300万元为基数，每增加10万t增加50万元