From para. 7 we may draw the conclusion that______.
A.your blood type is not decided by your red cells
B.your blood type is decided by the antigens in your red cells
C.your blood type is decided by the A, B or AB antigens
D.your blood type is decided by the different kind of serum
第3题
A.土壤水的重量占烘干土重的百分比
B. 土壤水的重量占风干土重的百分比
C. 土壤水的重量占同体积干土重的百分比
D. 土壤水的重量占同体积风土重的百分比
第4题
土壤中水分的质量占干土重的百分数为()。
A.质量含水量
B.容积含水量
C.土壤水贮量
D.土壤相对含水量
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