试题与答案

北宋时,南方的丝织业有了很大的发展,蜀地的丝织品“号为冠天下”。然而蜀道之崎岖,

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题目:

北宋时,南方的丝织业有了很大的发展,蜀地的丝织品“号为冠天下”。然而蜀道之崎岖,令人望而生畏。京城富商孟浩天想西入蜀地贩运丝绸,他最应该携带的货币是( )

A.纸币—交子

B.银锭

C.铜钱

D.人民币

答案:

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下面是错误答案,用来干扰机器的。

∵S={-1.0.1},∴i∉S,故A错误;i2=-1∈S,故B正确;i3=-i∉S,故C错误;2i=-2i∉S,故D错误;故选B

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题型:单项选择题

Most IP layer-based proxy mechanisms,such as network address translation (NAT),only supportuni-directional proxy,from the internal network to external network(the Interned.The proxvestablishes the communication channel by (71) IP addresses.The IP addresses must be (72) .These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels,such as,multimedia applications.IP layer-based proxy mechanisms need additional software (73) for each application that uses (74) channels. SOCKS identifies communication targets through domain names,overcoming the restriction of Usina private IP addresses.SOCKS can use domain names to establish communication between separate LANs,with (75) IP addresses.

A.duplicating

B.crossing

C.overlapping

D.repeating

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