His efforts to raise money for his program were ______ because, no one showed any intention to take a cent out of their pockets.

A．in place

B．in sight

C．in effect

D．in vain

等节奏流水是指同一施工过程在各施工段上的流水节拍都相等，但不同施工过程之间的流水节拍不完全相等的一种流水施工方式。