问题
单项选择题
如果发现水中S042-降低，则有可能是有（）等沉积。
A、Fe203
B、H2S
C、BaS04
D、NaOH
答案
参考答案：C
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如果发现水中S042-降低，则有可能是有（）等沉积。
A、Fe203
B、H2S
C、BaS04
D、NaOH
参考答案：C
| 根据下面的对话内容，从对话前的选项中选出能填入空白处的最佳选项，并将其选项标号填入文后 的答栏内。选项中有一项为多余选项。
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