clock &a

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clock&aclock&aclock&aclock&a表示是clock类型对象的一个引用变量；例：clock&a;clockb=newclock();a=b;a就是b对象的一个引用；这个引用就是变量

clock &a
clock &a

clock &a
clock &a 表示是 clock 类型对象的一个引用变量；
例：
clock &a ;
clock b = new clock();
a=b;
a就是b对象的一个引用；这个引用就是变量 b 的一个别名； a和b是一样的

clock &a A clock is on the desk.对A clock提问 This is a clock in English 对a clock提问 Is this a clock?回答 clock clock Do you have a clock?Are you have a clock?Does yDo you have a clock?Are you have a clock?Does you have a clock? this is a clock变成一般疑问句英语翻译比如·：There is a clock It's a clock.该怎么提问? The clock is a circle.是什么意思? This is a clock改为否定句 There's a clock on the It's a clock.该怎么提问? what a nice clock什么意思 A clock( )(有）three hands. have you got a nice clock? Is's a clock.该怎么提问?