MSC至BSC的接口称为（）接口，BSC至RBS2000的接口称为（）接口.
参考答案：A；A-BIS
所谓“三一律”：要用（），一天内完成一个故事，从开头到末尾维持着舞台充实。
A new big oilfield is reported______in the west of the country.
A．to have been found B．to be found C．found D．having been found
