While evaluating the Gantt chart，the project manager determines that the project is behind schedule．What should she do ？（）

A．Obtain approval from the customer to slip the projec

B．Report findings to managemen

C．Evaluate the alternatives with the tea

D．Evaluate the alternatives with the custome

一个电器元件，电压为220伏，通过的电流为22安，请计算它的电阻值？