酶的来源
参考答案:
适宜的细胞,在人工控制条件的生物反应器中生产各种所需的酶。
已知函数f(x)=mx3+2nx2-12x的减区间是(-2,2)。
(1)试求m,n的值;
(2)求过点A(1,-11)且与曲线y=f(x)相切的切线方程;
(3)过点A(1,t)是否存在与曲线y=f(x)相切的3条切线,若存在,求实数t的取值范围;若不存在,请说明理由。
An internet is a combination of networks connected by () . When a datagram goes from a source to a () , it will probably pass many () until it reaches the router attached to the destination network. A router receives a () from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet The decision is based on optimization: Which of the available () is the optimum pathway
An internet is a combination of networks connected by ().
A.modems
B.routers
C.switches
D.computers