电流正反馈是一种对系统扰动量进行补偿控制的（）方法。
参考答案：调节
—Here's a letter for you, Mrs. Brown.
—________. [ ]
A. Please give it to me.
B. Thanks a lot.
C. Yes, it's mine.
D. With pleasure.
卧床、无发热或异常消耗的成年男性病人每天最低热卡需求是（）。
A.15-20kcal／（kg·D.
B.25-30kcal／（kg·D.
C.30-50kcal／（kg·D.
D.50-60kcal／（kg·D.
E.75kcal／（kg·D.
