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

锅炉水冷壁的主要传热方式为（）

A、蒸发传热

B、对流传热

C、热辐射传热

D、热传导传热