“brace head”的概念、定义、翻译、参考文献-科学参考

单词	brace head
释义	brace head [`brās ´hed] ^ENGINEERING A cross handle attached at the top of a column of drill rods by means of which the rods and attached bit are turned after each drop in chop-and-wash operations while sinking a borehole through overburden. Also known as brace key.
随便看	break period breakpoint breakpoint switch breakpoint symbol break rolls breaks in overcast breakthrough breakthrough sweep efficiency break thrust breakup breakwater breast breastbeam breast boards breast drill breast hole breasting dolphin breast wall breastwork breather pipe breath-hold diving breathing breathing apparatus breathing bag breathing cave

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