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问题 单项选择题

2001年5月，中国大洋协会与国际海底管理局签订了《勘探合同》，以合同形式确定了我国在太平洋中部拥有专属勘探权和优先商业开采权的多少万平方千米多金属结核矿区？（）

A.77.5

B.17.5

C.7.5

D.7

答案

参考答案：C

单项选择题

Traditional Internet access methods like dial-up were so slow that host computers were connected to the dial-up. (6) at the customer premise over slow (7) ports. PPP was designed to run directly over these serial links. But with the advent of broadband Internet (8) technologies such as ADSL and cable modems there has been a considerable increase in the bandwidth delivered to the end users. This means that the host computers at the customer premise connect to the (9) or cable "modem" over a much faster medium such as Ethernet. It also means that multiple (10) can connect to the Internet through the same connection.

（10）是（）

A.cables

B.hosts

C.servers

D.modems
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单项选择题

投运后，110kV变电站蓄电池组每（）年进行1次全容量核对性充放电。

A.1

B.2

C.3

D.4
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