可延长锌锅使用寿命, 降低锌渣生成量,经济效益显著.Then the life of galvanized pot is increased, the slag reduced and economic benefit obtained.热镀锌行业每年产生5万余吨的锌渣.Over fifty thousand tons zinc slag is produced in hot zinc plated industry every yea...
You can leave a message on our answering machine.您可以在我们的答录机上留言。She was punished by teachers for answering back.她由于顶嘴而受到了老师的惩罚。I called several times, but only got the answering machine.我打了几次电话，但只有电话答录机答话。...