【单选题】The biggest barrier to sounding the alarm about bird flu is that people usually take flu seriously.
【简答题】 dialogues based on the following situation. The guest has booked a single room for September 12th to 16th. But he has to cancel the reservation for an important meeting. The reservationist answ...
【简答题】如何以大肠杆菌质粒 DNA为载体克隆一个编码动物激素的基因,并使之在大肠杆菌中进行表达?简要说明实验中可能遇到的问题及可能的解决办法。
【单选题】H7N9 bird flu is a virus(病毒) can make people die. We’d better stay away from birds at present.
【简答题】如何以大肠杆菌质粒 DNA 为载体克隆一个编码动物激素的基因,并使之在大肠杆菌中进行表达 ? 简要说明实验中可能遇到的问题及可能的解决办法。
【简答题】以大肠杆菌质粒DNA为载体克隆一个编码动物激素的基因,并使之在大肠杆中表达,通常遇到的问题是什么?
【简答题】() 是单位时间内,通常是早高峰小时,通过最大客流断面的车辆载客能力被刺用的百分数。