On a ship，a door that is required to be marked KEEP CLOSED is designed to ______．A.prevent the passage of flammable gasesB.prevent the passage of poisonous vaporsC.delay the spread of heat and flamesD.maintain watertight integrity

We returned school late from a party and found the door of the students' apartment ______.

A. had closed

B. close

C. to close

D. closed

Hardly ______ when the door suddenly closed.

A. they had arrived

B. they arrived

C. did they arrive

D. had they arrived

The international shore connection required on a ship is designed to ______．

A.Permit discharge of waste oil

B.Allow hook up of fire fighting water from a dock or another vessel

C.Satisfy pollution prevention requirements

D.Allow emergency use of the fire main for deballasting

By plotting the analysis messages on weather charts, we are able to ______.

A.prevent any possible accident at sea

B.prepare a reasonable forecast of the wind and weather

C.help the mariner to fix a accurate ship’s position

D.aid the salvage of a ship in peril

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(

The operator of each vessel subject to the pollution regulations is NOT required to keep written records of ______.

A.the name of each person designated as a person in charge

B.the date and results of the most recent equipment inspection

C.cargoes carried and dates delivered，including destinations

D.hose information not marked on the hose

______water is the water to keep the ship’s stability．

A.Bilge

B.Ballast

C.Slop

D.Sanitary