皮皮学，免费搜题
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【单选题】
正常状态下,下列哪种物质是肌肉最理想的燃料?( )A.
酮体
B.
葡萄糖
C.
氨基酸
D.
游离脂肪酸
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】机器零件在 三个方向上,每个方向至少有一个尺寸基准。
【单选题】What is the difference between horizontal e-marketplaces and vertical e-marketplaces?
A.
Vertical e-marketplaces support commerce between multiple industries; horizontal e-marketplaces support commerce between businesses from the same industries
B.
Vertical e-marketplaces support commerce between businesses from the same industry; horizontal e-marketplaces support commerce between businesses from different industries
C.
Horizontal e-marketplaces support commerce between businesses and consumers; vertical e-marketplaces support commerce between business and business
D.
Horizontal e-marketplaces support commerce between business and business; vertical e-marketplaces support commerce between consumer and business
【简答题】标注尺寸的 称为尺寸基准,机器零件在 三个方向上,每个方向至少有一个尺寸基准
【简答题】2) What is the difference between e-business and e-commerce?