摘要
介绍了原吊环穿管临时支护的缺点及手摇申缩式端头临时支护的特点,工作原理及应用中的优点。
the Weakness and hands that introduced the original ring to wear to take care of to pay to protect the at the time shake the characteristics the that the type of the constringency carries the a temporary the to protect, work principle and apply the medium advantage,
出处
《黑龙江科技信息》
2007年第11S期57-57,共1页
Heilongjiang Science and Technology Information
关键词
端头支护
申缩式
工作原理
the Carry the head pays to protect
The of constringency of The type
The work principle
