77. 下图表示“制作洋葱鳞片叶表皮细胞临时装片”实验的部分步骤,以及在显微镜下...
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75. 下图表示淀粉、蛋白质和脂肪在人体消化道中被消化的情况,据图回答第75、76题...
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71. 预防传染病的措施包括控制传染源、切断传播途径和保护易感人群。下列措施中,...
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63. 下图给出了某种生态系统中的一条食物链,下列相关叙述错误的是
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50.下面是植物细胞与动物细胞的结构模式图,其中能保护细胞内部、控制细胞内外物...
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64. 下列是某健康人血浆、原尿、尿液成分的化验数据(单位为g/100ml)。由上表所示...
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44. 为了探究光照对大豆幼苗生长的影响,某生物小组选择生长状况相仿的两盆大豆幼...
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