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【单选题】
草坪刈剪高度范围是由草种的特性决定的，每次刈剪时，剪去的部分应少于叶片自然高度的1/3，即遵循（）原则。
A.
修剪
B.
生长
C.
1/3
D.
刈剪
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【多选题】镰刀形红细胞贫血病患者血红蛋白β-链上第六位的谷氨酸被缬氨酸取代后，将产生哪些变化
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I see what you mean, but ….
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增加了异常血红蛋白的溶解度
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导致异常脱氧血红蛋白的解聚作用
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增加了异常血红蛋白向阳极移动的速度
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