智能天线的天线校正的目的是通过调整激励权值使得各个振元之间的（）保持一致。

A、幅度

B、相位

C、幅度和相位

D、功率

Many of the activities performed during the preliminary investigation are still being conducted in （）, but in much greater depth than before. During this phase, the analyst must become fully aware of the （） and must develop enough knowledge about the （） and the existing systems to enable an effective solution to be proposed and implemented. Besides the （） for process and data of current system, the deliverable from this phase also includes the （） for the proposed system.

the deliverable from this phase also includes the（）for the proposed system.

A．hardware and software specification

B．system performance specification

C．formal requirements definition

D．general problem statement