单词 | blocking and wedging |
释义 | blocking and wedging [¦bläk·iŋ ǝn `wej·iŋ] MINING ENGINEERING A method of holding mine timber sets in place; blocks of wood are set on the caps directly over the post supports and have a grain of block parallel with the top of the cap; wedges are driven tightly between the blocks and the roof. |
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