关于通电螺线管，下列因素的变化不会对它的磁性强弱产生影响的是 （  ）        

 金属单质A与非金属单质硫（S）发生如下反应：2A+S$\stackrel{△}{=}$A₂S。甲、乙、丙三组学生在实验室分别进行该实验，加入的A和硫的质量各不相同，但总质量均为6 g。充分反应时，实验数据记录如下：

根据上述信息，回答问题：
（1）元素A的相对原子质量为   。
（2）丙组实验中a∶b为   （结果以最简整数比表示，请写出计算过程）。

回答下列问题：

阅读理解，根据短文选择正确的一项

    One day a policeman was walking in the park. He saw a man there. The man was holding a penguin（领着一个企鹅）. The man said to the policeman, “ I found this penguin this morning. What shall I do with it?”“Take it to the zoo,” said the policeman. The next day the policeman saw the man again. He was still holding the penguin. The policeman said, “Why didn't you take the penguin to the zoo?”“I did,” said the man. “I took him to the zoo yesterday. Today I'm taking him to the cinema.

200cm=____m

6m=____cm