题目

挑选适宜播种的种子时，需要测定种子的发芽率，具体做法是（　　）          A．随机抓取20粒种子，发芽率超过90%                             B．挑选100粒种子，发芽率超过90%                                C．随机10粒种子，发芽率超过8%                                  D．随机100粒种子，发芽率超过90%                                答案：D

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