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土纲(Soil order)
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考题
He must use this surplus in three ways:as seed for sowing,as an insurance( )the unpredictable effects of bad weather and as a commodity which he must sell in order to replace old agricultural implements and obtain chemical fertilizers to feed the soil.A.for
B.against
C.of
D.towards
考题
填空题在中国土壤分类系统中,褐土属于弱淋溶土纲,燥红土属于(),黑垆土属于钙积土土纲。
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