题目内容
（请给出正确答案）
[主观题]
关于channel，下面语法正确的是（)
A. var ch chan int
B. ch := make(chan int)
C.<- ch
D. ch<-
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A. var ch chan int
B. ch := make(chan int)
C.<- ch
D. ch<-
如果结果不匹配，请 联系老师 获取答案
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下面不能用于对文法进行描述的是_______。
A．源语言
B．EBNF
C．BNF
D．语法图
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B.DS8000有4Gbps Fibre Channel/FICON？通道卡支持高速主机连接
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D.DS8000最多支持1024个磁盘，支持最大512TB
选出应填入下面一段英语中______内的正确答案。
In a public-key cryptosystem,(1)encrypted with the public key can only be deciphered with the private key from the same(2). Conversely,(1)encrypted with the private key can be decrypted only with the public key. Users can make their public keys(3)available or place them at a key distribution center or others to access. However, the private key must be(4)safe. In public-key systems there's no(5)to find a safe channel for communicating a shared secret key.
下面是一个符合短语结构语法定义的受限英语子集的语法： P：S→NP VP (a) NP→the NPl (b) NP→NP1 (c) NP1→ADJS N (d) ADJS→￠｜ADJ ADJS (e) VP→V (f) VP→V NP (g) N→boy｜Johnson｜blackball (h) ADJ→little｜dig (i) V→play｜run (j) 其中，大写的是非终结符，而小写的是终结符，￠表示空字符串。请依据该语法对句子 the boy plays the blackball 进行自顶向下的句法分析，并建立相应的句法分析树。
选出应填入下面一段英语中______内的正确答案。
Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support unidirectional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by(1)IP addresses. The IP addresses must be(2). 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(3)for each application that uses.(4)channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs,with(5)IP addresses.
