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根据下图回答

该生物细胞在有丝分裂过程中，纺锤体是由（）发出的（）形成的；在有丝分裂末期，不形成（），而是（）凹陷，把一个细胞分裂成两个子细胞

答案

参考答案：中心体，星射线，细胞板，细胞膜从中部

问答题 简答题

简述放射工作许可登记必须具备的基本条件。
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单项选择题

In the course of her researches, a historian recently found two documents mentioning the same person, Erich Schnitzler. One, dated May 3, 1739, is a record of Schnitzler’s arrest for peddling without a license. The second, undated, is a statement by Schnitzler asserting that he has been peddling off and on for 20 years.
The facts above best support which of the following conclusions

A．Schnitzler started peddling around 1719.

B．Schnitzler was arrested repeatedly for peddling.

C．The undated document was written before 1765.

D．The arrest record was written after the undated document.

E．(E) The arrest record provides better evidence that Schnitzler peddled than does the undated document.
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