某企业每天生产某种产品x单位时的总成本函数为C(x)=0.5x2+36x+9800(单位:元),试求每天生产多少单位产品可使其平均成本最低。
参考答案:
There are now______methods for studying color vision in infants than there once were.
A.more sophisticated than
B.much more sophisticated
C.much sophisticated
D.sophisticated
在变压器磁路中,磁通越大,磁阻越小。