一个钟表的秒针角速度为（   ）

A．πrad/s

B．2πrad/s

C．rad/s

D．rad/s

某个窗体已编写以下事件过程。打开窗体运行后，单击窗体，消息框的输出结果为_________。Private Sub Form_Click()Dim k As Integer, n As Integer, m As Integer n = 10: m = 1: k = 1Do While k <= n m = m * 2 k = k + 1Loop MsgBox mEnd Sub