relief holes 中文意思是什麼
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Subland twist drills with parallel shank for holes prior to tapping screw threads and for relief countersinks
留隙沉頭鉆和攻螺紋孔前用直柄多刃階梯麻花鉆 -
The statuses on operation and study of relief wells, drain holes and supply wells in the water resource projects are presented
摘要介紹了堤防減壓井和其他水利工程中採用排水孔、減壓井以及供水井的運行和研究狀況。
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