用下列哪种情况的肺炎双球菌感染健康小鼠会使之生病和死亡() A.加热杀死的 B.活的

题型:单项选择题

问题:

用下列哪种情况的肺炎双球菌感染健康小鼠会使之生病和死亡()

A.加热杀死的

B.活的,但缺乏多糖荚膜

C.加热杀死的有荚膜的肺炎双球菌和缺乏多糖荚膜的肺炎双球菌的混合物

D.既缺乏多糖荚膜又加热杀死的

考点:高考生物高考生物题库
题型:单项选择题

阅读理解。

     How do you like to go to school like this one in Oxford, England? There are no real classes. The students

go from one group to another when they want to. You may find students of fourteen, sixteen or twenty-one

years old all in the same group. They work at their own studies. Nobody tells them what they should do or

what they shouldn't do.

     The day I visited, school began at nine. Some students were listening to their own lessons. Others were

watching TV on physics. A group was working in the library. I didn't see anybody just sit doing nothing.

Everybody was studying.

    At lunch time I could see students working, too. They were talking about their lessons while they were

eating. When you think of those students, you can be sure it is one of the best schools in the world.

1. In this school in Oxford, the students _______.

A. are all teenagers

B. don' t study in groups

C. never study in any real classes

2. Every student is working at _______ in this school.

A. the same thing

B. a different thing

C. his or her own studies

3. It is true that _______.

A. this school is one of the best schools in the world

B. the students in this school like to study in the same group

C. the students in this school learn everything by discussing with others

题型:单项选择题

根据规定,船上弃船演习的内容应包括()I、每次演习均应启动并运转救生艇发动机;II、应准备执行应变部署表中规定的任务;III、应运转吊筏架;IV、应至少降下1艘救生艇

A.II~IV

B.I~III

C.I~IV

D.I、II、IV

题型:单项选择题

如图为两套实验装置.

(1)写出下列仪器的名称:①______;②______.

(2)仪器①~④中,使用时必须检查是否漏水的有______.(填序号)

(3)若利用装置I制取蒸馏水,还缺少的仪器有______,将仪器补充完整后进行的;实验操作的名称为:______,冷却水从______口进.

(4)现需配制250mL0.2mol/LNaOH溶液,其中装置II是某同学配制此溶液时移液操作的示意图,图中有两处错误分别是______,______.若定容时俯视刻度,所配的溶液的浓度会______;(填偏高、偏低、无影响,下同)若溶液未冷却,就转移到容量瓶中,所配溶液浓度______.

(5)若实验过程中出现如下情况应如何处理?加蒸馏水不慎超过了刻度,应______.

题型:单项选择题

节温器

题型:单项选择题

生态文明建设的前提和关键是()。

A.发展

B.开放

C.观念转变

D.以上都不是

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