孔内钻具遇上以下（）情况时，使用安全接头。
A、丝扣过紧
B、多头“插蜡”
C、孔内岩粉深沉
D、正常接钻
参考答案：A,B,C
根据句意和首字母提示填入所缺单词。
1. I like playing c_____ games.
2. I'm a student. I go to s_____ every day.
3. You can c_____ me at 5578964.
4. There is a set of k_____ on the desk.
5. I have two books and a n_____.
咬缝按其形状可为哪几种？
