皮皮学，免费搜题
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【单选题】
在同一个平面图上有( )条无差异曲线。A.
三条
B.
无数
C.
许多但数量有限
D.
一条
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】请同学们按照以下要求提交相应资料
【简答题】按照用途分类合金钢可以分为三类，即 、 和 。
【简答题】A．He should consume less salt. B．He should eat less fatty foods. C．He should add more protein products to his diet. D．He should consult to doctors more frequently.
【简答题】合金结构钢按照用途及热处理特点不同可以分为 、 、 、 、 。
【简答题】A．He should start with a light workout. B．He should go to have a check-up. C．He should eat less fatty foods. D．He should visit a fitness trainer.
【简答题】合金钢按照用途可以分为________、________和________。
【简答题】A．He should consume less salt． B．He should eat less fatty foods． C．He should add more protein products to his diet． D．He should reduce the consumption of sugar．
【简答题】A．He should consume less salt. B．He should eat less fatty food. C．He should add more protein products to his diet. D．He should take in more staple food.
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