如何用分子生物学技术区分“同卵双胞胎”与“来自同一供体的克隆动物”?
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Is there anyone in your family looking for a job? Yes, my sister is. She is()part time in a restaurant now, but she wants to change her job.
A. studying
B. working
C. eating
D. playing
在填料萃取塔正常操作时,连续相的适宜操作速度一般为液泛速度的50%~60%。
A. 正确
B. 错误