解释下面的函数及其四个参数connect (sender, SIGNAL(signal), receiver, SLOT(slot));
sender（信号的发出者）和receiver（信号的接收者）是QObject对象指针；signal（信号类型，如click）和slot(接收信号后要实现的功能，如close())是不带参数的函数原型；SIGNALE()和SLOT()宏的作用是把他们转换成字符串。
举一反三
- connect(timer,SIGNAL(timeout(),this,SLOT(）timeupdate()))中，timeout()是（）；timeupdate()是（ ）。 A: 发送的信号 B: 执行的槽 C: 发送信号的对象 D: 接收信号的对象
- connect(timer,SIGNAL(timeout()),this,SLOT(timerUpDate()));中，timeout（）是( )，timerUpdate（）是( ) A: 发送的信号 B: 执行的槽 C: 发送信号的对象 D: 接收信号的对象
- 在Qt程序设计中,凡是包含signal和slot的类中都要加上Q_OBJECT的定义。(<br/>)
- The main function of time signal is to connect details.
- GPS satellites send signal information, such as time, position of satellite, position of receiver, and traffic condition on the earth.
内容
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_____, the train started. A: The signal given B: Giving the signal C: The signal being given D: The signal giving
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MGW主机框中的Slot（）和Slot（）GPB负责ITU协议栈信令处理，并互为主备用关系，的Slot（）和Slot（）GPB负责MPT（中国）协议栈信令处理，并互为主/备用关系。
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2. Railway signals can be divided into home signal, starting signal, distant signal, repeating signal and shunting signal.
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翻译 sender and receiver
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what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete