Is an open standard promotes interoperability among the wireless client adapters and dial-in servers from different vendors.（）
有以下程序:include include using namespace std;int main ( ){ ofstream有以下程序: #include ＜iostream＞ #include ＜fstream＞ using namespace std; int main ( ) { ofstream ofile; char ch; ofile.open ("abc.txt"); cin＞＞ch; while (ch!='#' ) { cin＞＞ch; ofile.put(ch);A．程序编译时出错B．abc#C．abcD．#
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请认真阅读以下关于某传输系统的技术说明、状态转换图及C++代码，根据要求回答问题1和问题2。【说明】传输门是传输系统中的重要装置。传输门具有Open(打开)、Closed(关闭)、Opening(正在打开)、StayOpen(保持打开)和Closing(正在关闭)5种状态。触发状态的转换事件有click、complete和timeout 3种，事件与其相应的状态转换如图6-18所示。下面的【C++代码1】与【C++代码2】分别用两种不同的设计思路对传输门进行状态模拟，请填补代码段中的空缺语句。【C++代码1】const int CLOSED = 1; const int PENING = 2;const int PEN = 3; const int CLOSING = 4;const int STAYOPEN = 5; //定义状态变量，用不同整数表示不同状态class Door {private:private:int state; //传输门当前状态void setState(int state) { this-＞state = stale; } //设置当前状态public:Door () :state (CLOSED) { };void getState() { //根据当前状态输出相应的字符串switch(state) {case OPENING: cout ＜＜"OPENING" ＜＜ endl; break;case CLOSED: cout ＜＜ "CLOSED" ＜＜ endl; break;case OPEN: cout ＜＜ "OPEN" ＜＜ endl; break;case CLOSING: cout ＜＜ "CLOSING" ＜＜ endl; break;case STAYOPEN: cout ＜＜ "STAYOPEN" ＜＜ endl; break;}}void click() { //发生click事件时进行状态转换if ( (1) ) setState(OPENING);else if ( (2) ) setState(CLOSING);else if ( (3) ) setState(STAYOPEN);}void timeout() { //发生timeout事件时进行状态转换if (state == OPEN) setState(CLOSING);}void complete() { //发生complete事件时进行状态转换if (state == OPENING) setState(OPEN);else if (state == CLOSING) setState(CLOSED);}};int main(){Door aDoor;aDoor.getState(); aDoor.click(); aDoor.getState(); aDoor.complete();aDoor.getState(); aDoor.click(); aDoor.getState(); aDoor.click();aDoor.getState(); return 0;}【C++代码2】class Door {public:DoorState *CLOSED, *OPENING, *OPEN, *CLOSING, *STAYOPEN, *state;Door();virtual ～Door() { ... //释放申请的内存，此处代码省略};void s
Is an open standard promotes interoperability among the wireless client adapters and dial－in servers from different vendors.()A.WEPB.HTTPC.SSIDD.EAP
Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end－to－end communication?()A. L2TPB. IPsecC. PPTPD.RSA
Which statements can be inserted at the indicated position in the following code to make the program write 1 on the standard output when run？（） public class Q4a39 { int a = 1； int b = 1； int c = 1； class Inner { int a = 2； int get（） { int c = 3； // insert statement here return c； } } Q4a39（） { Inner i = new Inner（）； System.out.println（i.get（））； } public static void main（String args[]） { new Q4a39（）； } } A、c = b；B、c = this.a；C、c = this.b；D、c = Q4a39.this.a；E、c = c；
What will be the result of attempting to compile and run the following code？（） public class Q6b0c { public static void main（String args[]） { int i = 4； float f = 4.3； double d = 1.8； int c = 0； if （i == f） c++； if （（（int） （f + d）） == （（int） f + （int） d）） c += 2； System.out.println（c）； } } A、The code will fail to compile.B、0 will be written to the standard output.C、1 will be written to the standard output.D、2 will be written to the standard output.E、3 will be written to the standard output.
If you needed to transport traffic coming from multiple VLANs （connected between switches）， and your CTO was insistent on using an open standard，which protocol would you use？（）A、802.11BB、spanning-treeC、802.1QD、ISLE、VTPF、Q.921
