IP地址“202.96.209.5”属于()类地址。
A、A类
B、B类
C、C类
D、保留
参考答案:C
—Flight CA 581_____________. I must be off now. —Have a nice trip.
A.is being announced
B.has announced
C.was announcing
D.will be announced
影响原生质体培养的因素有哪些?简述原生质体培养的程序。