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【单选题】
Last year was the (118th----180th) year of the horse race called the Kentucky Derby.
A.
118th
B.
180th
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A.
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B.
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【单选题】下列哪些因素影响土壤的氧化还原状况( )。
A.
土壤pH值
B.
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C.
土壤通气状况
D.
以上因素都是
【判断题】钢直尺的刻线间距为1mm,而刻线本身的宽度就有0.1~0.2mm,所以测量误差比较大。
A.
正确
B.
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【多选题】下列哪些因素会影响土壤中微量元素的有效性( )
A.
土壤酸碱度
B.
土壤氧化还原电位
C.
土壤通透性
D.
土壤水分状况
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