问System.Timers.Timer是否在独立线程中运行？

EN

class Program
{
    static System.Timers.Timer timer = new System.Timers.Timer();
    static System.Timers.Timer timer2 = new System.Timers.Timer();
    static System.Timers.Timer timer3 = new System.Timers.Timer();

    static void Main(string[] args)
    {
        timer.Elapsed += new System.Timers.ElapsedEventHandler(
            timer_Elapsed);
        timer2.Elapsed += new System.Timers.ElapsedEventHandler(
            timer2_Elapsed);
        timer3.Elapsed += new System.Timers.ElapsedEventHandler(
            timer3_Elapsed);

        timer.Interval = 1000;
        timer2.Interval = 1000;
        timer3.Interval = 1000;

        timer.Start();
        timer2.Start();
        timer3.Start();

        Console.WriteLine("Press \'q\' to quit the sample.");
        while (Console.Read() != 'q') ;
    }

    static void timer3_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        timer3.Stop();
        Console.WriteLine("Timer 3 Hit...");            
        timer3.Start();
    }

    static void timer2_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        timer2.Stop();
        Console.WriteLine("Timer 2 Hit...");
        Thread.Sleep(2000);
        timer2.Start();
    }

    static void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {
        timer.Stop();
        Console.WriteLine("Timer 1 Hit...");
        Thread.Sleep(10000);
        timer.Start();
    }
}