Through the project case histories the paper analysed the causes of forming the cast drill rod and an useful protection measure is taken.
该文通过工程实例分析了形成铸钻杆的原因，并采取了有效的防治措施，在施工中降低了事故的发生率。
Through the project case histories the paper analysed the causes of forming the cast drill rod and an useful protection measure is taken.
该文通过工程实例分析了形成铸钻杆的原因，并采取了有效的防治措施，在施工中降低了事故的发生率。
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