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农业机械技术维护
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农业机械技术维护
为延长机器(包括各种农用动力及农业机械)使用寿命,使其经常保持在良好技术状态所采取的各种技术措施及管理方法。
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covariant quantization
covariant set
covariant spinor
covariant tangent bundle
covariant tensor
covariant tensor algebra
covariant tensor field
covariant tensor fields on complex manifold
covariant transformation
covariant valence
covariant vector
covariant vector field
covariant wave equations
covariate-adaptive randomization
covariate-adjusted response-adaptive randomization
covariate imbalance
covariate measure error
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