转染
参考答案：
用离体状态的病毒DNA或RNA感染感受态细菌，从而改变细菌基因型的作用。
加油员未等车辆熄火就加油可能会引发（）。
A、走单
B、客户投诉
C、客户打骂事故
D、火灾事故
At year-end , Sun company reported cost of goods sold of $ 400 million. Ending accounts payable is $100 million, Assuming there are 365 days in a year, How many days on average it takes Sun company to pay its suppliers.（）
A．80.75 days
B．91.25 days
C．102.25 days
