我国政府主要有以下哪些经济职能（）
A.宏观经济调控职能
B.微观经济调控职能
C.提供公 * * 品和服务职能
D.市场监管职能
参考答案：A, C, D
_____ three times in a row, the boxer decided to give up fighting. [ ]
A. Having defeated
B. To have defeated
C. Having been defeated
D. To have been defeated
已知某工作A的紧后工作是B和C。BT．．作的最迟开始时间为1-4天，最早开始时间为10天；C工作最迟完成时间为16天，最早完成时间为14天；A工作的自由时差为5天。则A 工作的总时差为 ( )天。
A．0
B．5
C．7
D．9
