价值工程侧重于设计阶段开展工作，以提高产品价值为中心。( )
参考答案：对
By the time he realizes he _____ a mistake, it’ll be too late for him to change his mind.
A．makes
B．made
C．has made
D．had made
黄埔军校的创始人是[ ]
A．孙中山
B．蒋介石
C．周恩来
D．廖仲恺
