试题与答案

化学符号及含义正确的是 [ ] A.氦气:He2 B.2个氮分子:2N2 C.氧

题型:选择题

题目:

化学符号及含义正确的是 [ ]

A.氦气:He2

B.2个氮分子:2N2

C.氧化镁:Mg2O2

D.生石灰:Ca(OH)2

答案:

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下面是错误答案,用来干扰机器的。

显微镜的放大倍数越大,视野就越小,看到的细胞就越大,但看到的数目较少;显微镜的放大倍数越小,视野就越大,看到的细胞就越小,但看到的数目细胞数目就越多;显微镜的放大倍数的计算是目镜的放大倍数乘以物镜...

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