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问题 单项选择题

通过滚珠螺纹旋合钢球中心的直径称（）

A.公称直径

B.大径

C.小径

答案

参考答案：A

单项选择题

下列说法错误的是（）。

 

A．在标准条件下，反应：的原电池图式为：

B．锌的浓差电池，其原电池符号为：（-）Zn|Zn2+（1.0mol·L-1）‖Zn2+（0.0010mol·L-1）|Zn（+）

C．已知原电池图式为：（-）Pt|Sn2+，Sn4+‖Fe3+，Fe3+｜Pt（+）在标准条件下，其电池反应不可以写成

D．已知电极反应：氧化还原电对的符号是I2/I-。
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填空题

Questions 22-27


Complete the summary below.
Choose

NO MORE THAN TWO WORDS

from the passage for each answer.
A research on SIV has been launched by some scientists who have done experiments on numerous animals, first with collections of animals’ (22) , then scientists receiving information about animals’ infection by drawing (23) . They have established links of strains with (24) again. So, it is evident after the analysis of strains that times for which (25) choose the variety of animals is much more than that of human malaria. As a consequence, it is fairly easy for HIV to find suitable inhabits for humans and their relatives are alike in (26) . But it is concerned that (27) has been invaded by human malaria strains and new virus would be born from both human and their relatives.
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