取生长健壮的小麦根尖,经过解离、漂洗、染色、制片过程,制成临时装片,放在显微镜下观察

题型:单项选择题

问题:

取生长健壮的小麦根尖,经过解离、漂洗、染色、制片过程,制成临时装片,放在显微镜下观察。欲观察到细胞有丝分裂的前、中、后、末几个时期()

A.应该选—个处于间期的细胞,持续观察它从间期到末期的全过程

B.如果在低倍镜下看不到细胞,可改用高倍物镜继续观察

C.如果在一个视野中不能看全各个时期,可移动装片从周围细胞中寻找

D.如果视野过暗,可以转动细准焦螺旋增加视野的亮度

考点:高中生物细胞增殖细胞增殖题库
题型:单项选择题

短文改错(共10小题,每小题1分,满分10分)

注意:没处错误及其修改均仅限一词;

只允许修改10处,多者(从第11处起)不计分。

As we all known, the disabled are also important members of our society. Unfortunate, they can not do everything like another healthy people because of their disabilities. We need help from others. As a healthy people, we should show them our sympathy (同情)and help them. We should not make funny of them or ignore them. Just accept them for who they were, and help them adjust to the surrounding. When they fail, we can help them in many way, like saying “never mind” to them, giving them encouragement, or help them face the next challenge. In my view, helping the disabled is the duty of everyone rather than only the government.

题型:单项选择题

万维网由客户机、WWW服务器和()组成。

A.搜索引擎

B.超文本传输协议

C.终端机

D.邮件服务器

题型:单项选择题

急性肾小管坏死是引起肾性急性肾衰竭的最常见、最重要的原因。

题型:单项选择题

肥胖者适宜的膳食为()。

A.高蛋白、高碳水化合物膳食

B.高能量、高蛋白膳食

C.低能量、高蛋白膳食

D.低能量、低蛋白膳食

E.低蛋白、低碳水化合物膳食

题型:单项选择题

从原理上,聚丙烯的生产方法可以分为()、()、()、();Unipol聚丙烯装置采用的是()。

更多题库