（）is a type of bar chart that illustrates a project schedule. It illustrates the start and finish dates of the terminal elements and summary elements of a project.

A、gantt chart

B、project histogram

C、milestone chart

D、project flowchart

线路绝缘化处理后可以（），保证供电可靠性。

A.提高系统电压

B.降低网损

C.防止短路

D.提高功率因数