【单选题】【消耗次数：1】
石榴原产地在（ ）环境
①
A边缘皱波状
②
B基部具柄
③
C边缘具长刺
④
D边缘撕裂状
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相关题目
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钢筋混凝土梁受拉区边缘开始出现裂缝是因为受拉边缘（ ）。
①
受拉混凝土的应力超过混凝土的实际抗拉强度
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受拉混凝土的应变达到混凝土的极限拉应变
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受拉混凝土的应力达到混凝土的抗拉强度设计值
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受拉混凝土的应力达到混凝土的抗拉强度标准值
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