挖掘机的双闭环是什么?
参考答案:
电压反馈环(又称速度环),电流反馈环(又称转矩环)。
— How long do you think it'll be _____ I can go back to work?
— Well, you'll be feeling much better by next weekend. [ ]
A. before
B. when
C. until
D. that
下列哪个式子定义的是燃油里程SR()
A、SR=地速/总燃油流量
B、SR=真速/总燃油流量
C、SR=表速/总燃油流量