appliance（）

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appliance（）

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单选题

在C#中，对于下列代码的出错原因,描述正确的是( )class Program { static void Main(string[] args) { //创建Appliance对象时报错 Appliance apl = new Appliance(); Appliance mlp = new MobilePhone(); } } abstract class Appliance { public abstract void Charge(); } class MobilePhone : Appliance { public void Call() { Console.WriteLine("手机可以打电话。"); } public override void Charge() { Conso

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单选题

在C#中，对于下列代码的出错原因,描述正确的是（）abstract class Appliance { public abstract void Charge(); } //MobilePhone位置报错 class MobilePhone : Appliance { public void Call() { Console.WriteLine("手机可以打电话。"); } }

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SCBA is a device worn by firefighters to provide breathable air in an immediately dangerous to life or health atmosphere. Here SCBA means ____ .A. Self Containing Breathing Apparatus B. Self Contained Breathing ApparatusC. Self Contained Breathing Appliance D. Self Containing Breathing Appliance

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单选题

The appliance shall be so constructed that the end from which the rocket is ____can be positively identified by day or night. A. rejected B. objected C. ejected D. injected

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