... digging cut 蔬菜采收时的局部机械损伤 forearm digging 小臂垫球 hard digging 难钻的 ...
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阐述了难钻进地层用新型金刚石钻头的结构、制造特点，射流式钻具的原理、类型，以及防塌型稀释剂的作用机理。
The structure and manufacture of new type of bits, working principle and types of fluidic drilling tools, action mechanism of anti-cave-in thinners, for difficult formation drilling were discussed.
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