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(1)在观察人体口腔上皮细胞时,出现了图一中甲的情况,要将视野中细胞的位置由甲调整 成乙,应向
(2)通过图二的观察我们知道洋葱鳞片叶内表皮细胞比人的口腔上皮细胞多了液泡和
(3)图三是用显微镜观察人血永久涂片时看到的各种血细胞,视野内体积最大的血细胞是
(4)某生物兴趣小组
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并将得到的数据列表如下:
实验组别 | A 组 | B 组 | C 组 | D 组 | E 组 |
酒精体积分数 | 清水 | 5%酒精 | 10%酒精 | 15%酒精 | 20%酒精 |
心率平均值(次/10 秒) | 33 | 24 | 21 | 17 | 0 |
请根据上表的内容回答下列问题:
a.每组实验都重复做 3 次,取平均值,这样做的目的是为了减少
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b.分析表中数据,你得出的结论是:酒精对水蚤的心率
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同类型试题
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
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