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“槐林五月漾琼花,郁郁芬芳醉万家,春水碧波飘落处,浮香一路到天涯。”每年4-5月间槐花盛开,银白无瑕,绿浪浮动,蜂蝶飞舞,百里飘香。请分析回答下列问题: (1)“千树万树槐花开,招引蜜蜂采蜜来”,槐花属于虫媒花,在结构上适于招引昆虫的特点为_______________。 (2)槐树的果实是狭长的荚果(如图),内含多粒种子,这是因为每朵槐花的子房里生有 。 (3)蜜蜂是完全变态发育的昆虫,它的发育过程要经过受精卵→ →成虫阶段。 (4)槐花蜜水白透明、蜜质浓稠、清淡幽香,富含维生素和氨基酸,是蜂蜜中的上品。某同学想知道槐花蜜中是否含有维生素C(说明:维生素C有较强的还原能力,能使高锰酸钾溶液褪色),请你帮助他完成实验设计: ①取甲、洁净的试管,各注入2毫升 。 ②用滴管向甲试管中滴入稀释后的槐花蜜,试管中滴入 ,加边振荡,注意观察试管中溶液颜色的变化。 ③若 ,则说明槐花蜜中含有维生素C。
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单纯性阑尾炎
B.
穿孔性阑尾炎
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坏疽性阑尾炎
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A.
正确
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错误
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A.
however
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【单选题】男,40岁,因急性阑尾炎人院,入院后腹痛曾有短暂的缓解,以后又呈持续性加剧,应考虑
A.
单纯性阑尾炎
B.
化脓性阑尾炎
C.
坏疽性阑尾炎
D.
穿孔性阑尾炎
E.
阑尾周围脓肿
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A.
正确
B.
错误
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A.
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A.
T
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F
C.
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