蝗虫所具有的结构是 A．背覆鳞片 B．有外骨骼

蝗虫所具有的结构是

A．背覆鳞片 B．有外骨骼

C．骨骼无肌肉附着 D．具发达胸骨

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蝗虫所具有的结构是 A． 背覆鳞片 B． 有外骨骼

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蝗虫所具有的结构是 A．背覆鳞片 B．有外骨骼