协调控制系统运行方式中，其中最为完善、功能最强大的方式是（）。
参考答案：协调控制方式
石料在砌筑前必须（）。
Where did Columbus first set foot on the New Continent
A．Watling Island.
B．At the spot where a carved stone was erected to mark the event.
C．Somewhere in eastern Bahamas.
D．No consensus has been reached on the event among historians.
