题目内容

降低产品销售价格10%与单位变动成本增加10%对利润的影响是一致的（）

A. 对
B. 错

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有人说风筝的前身是一种能终日飞行的木鸟。但更可能的是斗笠被大风吹起时产生的灵感让古人发明了风筝Legends say that inspiration for kites was a wooden bird flying all day. Most likely, people a hat blown off by the wind and feng zheng

还有些传说古代的将军令人用牛皮作巨大的风筝绑上竹哨. 发出恐怖的声音以瓦解敌方的士气 also say that a general bound bamboo whistles on a huge feng zheng made of ox hide. The kite made horrible sounds to _.

或者将情报写在风筝上送达远方.将风筝用于军事仅仅是传说而已.说到底风筝还是一种玩具Other versions say he wrote on feng zheng and sent them to his troops. The of kites was just . After all, fengzheng are toys

传统的风筝使用竹子，藤条或其他一些强大的，但灵活，木材的桅杆;帆用的纸或轻织物，如丝绸;飞成线或线_ use bamboo, rattan or some other strong, but _, wood for the spars; paper or light fabrics such as silk for the sails; and are flown in string or twine