题目：
什么是机翼的展弦比？
答案：
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参考答案：D解析：细菌性痢疾粪便检查粪便量少，外观多为黏液脓血便，常无粪质。镜检可见满视野散在的红细胞以及大量成堆的白细胞（≥15个／高倍视野）和少量巨噬细胞。霍乱患者悬滴检查（动力试验），如动力试验...
什么是机翼的展弦比？
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