“piston drill”的概念、定义、翻译、参考文献-科学参考

单词	piston drill
释义	piston drill [`pis·tǝn ¦dril] ^{MECHANICAL ENGINEERING} A heavy percussion-type rock drill mounted either on a horizontal bar or on a short horizontal arm fastened to a vertical column; drills holes to 6 inches (15 centimeters) in diameter. Also known as reciprocating drill.
随便看	file file control system file event file gap file-handling routine file hardness file header file identification file layout file locking file maintenance file management system file manager file name file opening file organization file organization routine file-oriented system file printout file processing file protection file protection ring file reference file reorganization file search

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