保存菌种最佳方法是
A．4℃冰箱
B．低温冰箱
C．半固体高层
D．冷冻真空干燥
E．液体培养基
参考答案：D
用所给词的正确形式填空
1. ________ (who)radio is this?
2. There are five _______(novel) on the desk.
3. ________ (they)classroom is big, but _______ (our) is small.
4. They have a cat._______ (it) name is Mimi.
5. These CDs are ________ (Ben).They are not ________ (Kitty).
财务分析中的净利润是指()。
A.利润总额
B.息税前利润
C.税后利润
D.税前利润
