... air placed concrete 喷注混凝土 air placer 混凝土气力压送机 air placing machine 混凝土气力压送机 ...
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In conducting coastal open air placer mining or shore-based well drilling to exploit seabed mineral resources, effective measures must be taken to prevent pollution to the Marine environment.
露天开采海滨砂矿和从岸上打井开采海底矿产资源，必须采取有效措施，防止污染海洋环境。
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