实现预算收支任务的关键步骤是（）。
A.预算的规划
B.预算的制定
C.预算的执行
D.预算的监督
参考答案：C
All the preparations for the task ________， and we're ready to start.
A．completed
B．have completed
C．will be completed
D．have been completed
泵升电压对系有何影响？
