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archival secrecy
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archival secrecy
档案保密
各机关、单位和国家档案管理机构,为达到保守档案中国家秘密、商业秘密和个人隐私信息的目的,采取一定保密手段和防范措施,依法开展的一项业务活动。
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coal-based fuel
coal based methanol
coal-based methanol
coal-based methanol; ether mixed fuel
coal-based methanol synthesis
coal-based mixed alcohols synthesis
coal-based oxygenates synthesis
coal basin
coal basin analysis
coal-bearing coefficient
coal-bearing density
coal-bearing formation
coal-bearing property
coal-bearing strata
coal-bearing system
coal bed
coal bedding sets
coalbed gas
coalbed gas content
coal-bed gas exploitation
coalbed metahne prospecting
coalbed methan
coalbed methane
coalbed methane accumulation area
coalbed methane accumulation zone
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