He went from door to door, gathered waste papers and magazines.()
He went from door to door, gathered waste papers and magazines.()
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___ don’t have to pay for large shopping spaces and thus are able to sell their goods at lower prices. A.Mail-Order HousesB.Door-To-Door SellersC.Specialty StoresD.General Stores
阅读以下说明和C++代码。【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)五种状态。触发传输门状态转换的事件有click、complete和timeout三种。事件与其相应的状态转换如下图所示。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，请填补代码中的空缺。【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：int state； //传输门当前状态void setState(int state){ this-＞state=state；} //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 setState(DoorState *state) { this-＞state = state；}void getState(){//此处代码省略，本方法输出状态字符串，//例如，当前状态为CLOSED时，输出字符串为“CLOSED”}；void click()；void timeout()；void complete()；}；Door::Door(){CLOSED = new DoorClosed(this)； OPENING = new DoorOpening(this)；PEN = new DoorOpen(this)； CLOSING = new DoorClosing(this)；STAYOPEN = new DoorStayOpen(this)；state = CLOSED；}void Door :: click() {(4)；)void Door :: timeout() {(5)；)void Door :: complete() {(6)；}class DoorState//定义一个抽象的状态，它是所有状态类的基类{protected：Door *door；public：DoorState(Door *door) {this-＞door = door；}virtual～DoorState(void)；virtual void click() {}virtual void complete(
18． —What's behind ________door? I can’t open it．—Let me see．Oh，there is ________chair．A． the；aB． a；theC． a；aD． the，the
对下面的代码，哪段描述是错误的？（) public class Door{ } public class House{ public House（){ Door door = new Door（);}}A．Door是一个类。B．House是一个从Door继承的类。C．House的构造函数中声明了一个名为door的变量。D．door是一个对象。
目前，海运集装箱货物交接的常见方式有CY/CY和CFS/CFS。下列（）适合整箱交、拼箱接（FCL/LCL）。A．CY-CFSB．CY-DOORC．DOOR-DOORD．DOOR-CFS