取生长健壮的小麦根尖，经过解离、漂洗、染色和制片过程，制成临_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

取生长健壮的小麦根尖，经过解离、漂洗、染色和制片过程，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．应该选一个处于间期的细胞，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亮度

答案

答案：C

填空题

用方框中所给词或词组的正确形式填空，每个词或词组只用一次

be different from; help... with; take the subway; think of; get to; look after; move; have a picnic; stand for; grow up

1. My mother was out, so I had to                          my little sister at home.
2. What about                                     in the park on Sunday?
3. Miss Gao often                                       to work.
4. The weather in China                                        that in America.
5. The twins were born in New York, but they                          in London.
6. He                          school at 7:30 every day.
7. —What do you                            the Chinese people?
    —They are very friendly.
8. Jim, let's             the stone, it's dangerous on the road.
9. UN                           the United Nations.
10. She often ______ me ______ my English.

判断题

特种设备作业人员应当自觉接受用人单位的安全管理。