汽轮机为何采用多级抽汽回热加热?
参考答案:
汽轮机采用多级抽汽回热,使凝结水在各级加热器中逐渐提高温度,以减少过大的传热温差所造成的功能力损失。
以下叙述中正确的是( )。
A.Private Sub Form_Mouse Down(Button As Integer,Shift As Integer,- X As Single,Y As Single) If Button=2 Then PopupMenu Bs,2 End Sub
B.Private Sub Form_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs End Sub
C.Private Sub FOrm_MouseDown(Button As Integer,Shift As Integer,- X As Single,Y As Single) PopupMenu Bs,0 End Sub
D.Private Sub Form_MouseDown(Button As Integer,Shin As Integer,- X As Single,Y As Single) If(Button=vbLeftButton)Or(Button=vbRightButton)Then PopupMenu Bs End Sub
韦伯的“理想的行政组织”理论对于西方行政学的发展影响深远,他的贡献主要在于哪三个方面?