方案1的投资额大于方案2的投资额,若差额投资净现值△NPV12大于零,则说明 ( )。
A.方案1优
B.方案2优
C.方案1和方案2相同
D.无法判断
参考答案:A
— Shall we go to the sea animal show tomorrow?
— ______. [ ]
A. Thank you
B. Good idea
C. It doesn't matter
D. It's very kind of you.
胀接管子外壁与管板孔壁的表面粗糙度合适与否将直接影响到胀接强度和密封性能。( )