GB - Chinese national standards

Calculation of load capacity of spur and helical gears—Part 31:Calculationexamples of micropitting load capacity

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Calculation of load capacity of spur and helical gears—Part 4: Calculation of tooth flank fracture load capacity

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Calculation of load capacity of spur and helical gears—Part 5:Strength and quality of materials

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Calculation of load capacity of spur and helical gears—Part 6:Calculation of service life under variable load

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Detection method of activity and impurity of proteinase K

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Determination of the activity of desoxyribonuclease

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Agricultural service—Specification for land trust service

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Agricultural service—Classification

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Agricultural services—Basic requriement for agricultural information service organization (station)

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Agriculture service—General requirement of comprehensive utilization of agricultural waste

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