The loading characteristics and destruction pattern of DTH hammer pistons are examined.On the basis of this,Some measures are put forward to prolong the Service life of the piston.是什么意思_The loading characteristics and destruction pattern of DTH hammer pistons are examined.On the basis of this,Some measures are put forward to prolong the Service life of the piston.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句