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Light travels at about ___.
A.300,000 kilometres a second
B.a second 300,000 kilometres
C.every second 300,000 kilometres
D.300,000 kilometre every second
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更多 “ Light travels at about ___. A.300,000 kilometres a secondB.a second 300,000 kilometresC.every second 300,000 kilometresD.300,000 kilometre every second ” 相关考题
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听力原文：M: So, Jane, how long have you been an author?W: Well, Tom, I didn't start writing until I was in my thirtieth, and I'm over seventy now. So goodness, I must have been writing for about forty years.How long has the woman been an author?A．About 30 years.B．About 40 years.C．About 60 years.D．About 70 years.
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How many hours of housework did men do every week in the 1970s?A. About 23. B. About 26.C. About 13. D. About y.
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How many hours of housework did men do every week in the 1970s?A．About 23.B．About 26.C．About 13.D．About y.
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Dishes in Sichuan are noted for their varied and ( )flavors.A. freshB. tenderC. heavyD. light
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The word "diffuses" in Para. 3 is closest in meaning to ______.A) yieldsB) startsC) surfacesD) travels
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阅读下列说明和C++代码，回答问题，将解答填入答题纸的对应栏内。
【说明】
某灯具厂商欲生产一个灯具遥控器，该遥控器具有7个可编程的插槽，每个插槽都有开关按钮，对应着一个不同的灯。利用该遥控器能够统一控制房间中该厂商所有品牌灯具的开关，现采用Command(命令)模式实现该遥控器的软件部分。Command模式的类图如下图所示。
【C++代码】
class Light {public: Light(stringname) { /* 代码省略 */ } void on() {/* 代码省略 */ } // 开灯 void off() {/* 代码省略 */ } // 关灯};class Command {public: （1） ;}；class LightOnCommand:public Command { // 开灯命令private: Light* light;public: LightOnCommand(Light* light) { this->light=light; } voidexecute() { （2） ; }};class LightOffCommand:public Command { // 关灯命令private: Light *light;public: LightOffCommand(Light* light) { this->light=light; } voidexecute() { （3） ; }};class RemoteControl{ // 遥控器private: Command*onCommands[7]; Command*offCommands[7];public: RemoteControl() { /* 代码省略*/ } voidsetCommand(int slot, Command* onCommand, Command* offCommand) { （4） =onCommand; （5） =offCommand; } voidonButtonWasPushed(int slot) { （6） ; } voidoffButtonWasPushed(int slot) { （7） ; }};int main() { RemoteControl* remoteControl=new RemoteControl(); Light*livingRoomLight=new Light("Living Room"); Light*kitchenLight=new Light("kitchen"); LightOnCommand*livingRoomLightOn=newLightOnCommand(livingRoomLight); LightOffCommand* livingRoomLightOff=newLightOffCommand(livingRoomLight); LightOnCommand*kitchenLightOn=new LightOnCommand(kitchenLight); LightOffCommand* kitchenLightOff=new LightOffCommand(kitchenLight); remoteControl->setCommand(0, livingRoomLightOn, livingRoomLightOff); remoteControl->setCommand(1,kitchenLightOn, kitchenLightOff); remoteControl->onButtonWasPushed(0); remoteControl->offButtonWasPushed(0); remoteControl->onButtonWasPushed(1); remoteControl->offButtonWasPushed(1); /* 其余代码省略 */ return 0;}
考题
People are moving from major cities to smaller ones.A:big
B:important
C:heavy
D:light
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