调节器的正反作用的定义?
参考答案:
当被调参数(即变送器送来的信号)增加时,调节器的输出也增加的成为正作用;如果调节器的输出随被调参数的增加而减少的则称为反作用。
—Do you think you will be able to finish your writing by five o’clock today?
— ______. I’ll be busy with experiments all day.
A.Not a chance
B.Not a little
C.Not to mention it
D.Not a big deal
6个月的健康婴儿体重7kg,为适应正常的生长发育需要,每日要供给热量
A.2092kJ/kg(500kcal/kg)
B.1674kJ/kg(400kcal/kg)
C.1255kJ/kg(300kcal/kg)
D.837kJ/kg(200kcal/kg)
E.418kJ/kg(100kcal/kg)