井下一旦发生爆炸，防爆门被气流冲开，起到排泄作用，以保护主要通风机。（）
参考答案：对
选择正确的单词补全句子。
1. Mary is my friend. She is a ____________ (boy, girl).
2. She has black hair and yellow face. She is from ____________ (Chinese, China).
3. What's his ____________ (name, names)?
4. She ____________ (like, likes) music.
氟电极对氟硼酸盐离子（BF4-）不响应，如果水样中含有氟硼酸盐或者污染严重，则应先进行蒸馏。
