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农业航空作业质量技术指标 播撒作业
The operative indices of quality and techniques of agriculture and forestry aviation Sowing operation
价格:¥0.00
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通用航空专业中、高级技术资格评审条件
Requirements for Evaluating the Qualifications of Engineer and Senior Engineer in General Aviation
价格:¥0.00
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航空摄影术语
Terms of aerial photography
价格:¥0.00
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