Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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The results of experiments involving direct comparisons of root and penetrometer resistance
indicate that penetrometers experience two to eight times greater resistance than plant roots
penetrating soil (Table 1). Dexter (1987) suggests that this ratio of penetrometer resistance to root
resistance is positively correlated with soil strength, being greater in ‘stronger’ soils. At present
there is neither theoretical basis for this suggestion nor sufficient published data to justify such a
conclusion, although the need for accurate prediction of this ratio is clear.
Indirect evidence...
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RECOMMENDED VENTILATION STRATEGIES FOR ENERGY-EFFICIENT PRODUCTION HOMES
