起钻拔活塞应该如何处理？
参考答案：
应该通井到底，大排量循环调整泥浆，正常后再起钻，起钻要用I挡起钻。
The ______ Method emphasizes on the importance of spoken language. Believing in the natural process of language learning and in the inductive teaching of grammar.
单务合同
