《中华人民共和国飞行基本规则》第十六条规定，固定航线通常不得与航路、临时航线交叉或者通过飞行频繁的机场上空。
参考答案：错
补全单词。
1. If you have a t_________ , you should see a dentist.
2. The little girl's i_________ (ill) is very serious, we must take her to the hospital at once.
3. —I have a sore throat.
—You should drink lots of w_________.
4. She has a fever .She should lie down and r__________.
5. I’m not feeling w________, I have a cold.
进行测定时，土壤不需要风干和研碎，应直接提取测定。
