问答题

2、把一个五进制计数器与一个四进制计数器串联可得到[填空(1)] 进制计数器.

答案： 20

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单项选择题

Which of the ligation mode isdirectional and the efficiency is the highest between the target gene and thevector?
A、The sticky end produced by one restriction endonuclease
B、The blunt end produced by one restriction endonuclease
C、Sticky ends produced by two different restriction endonucleases
D、
The blunt end produced by two restriction endonucleases
E、Two blunt ends produced by the filling of sticky ends

不定项选择

伯特兰德模型是价格竞争模型，只要有一个竞争对手存在，均衡价格就会等于边际成本。（）

A．正确
B．错误