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【单选题】
Otto S., an overweight medical student (see Chapter 1), discovered that he could not exercise enough during his summer clerkship rotations to lose 2 to 3 lb/wk. He decided to lose weight by eating only 300 calories/day of a dietary supplement that provided half the calories as carbohydrate and half as protein. In addition, he consumed a multivitamin supplement. During the first 3 days on this diet, which statement best represents the state of Otto ’ s metabolism?A.
His protein intake met the Recommended Dietary Allowance (RDA) for protein.
B.
His carbohydrate intake met the fuel needs of his brain.
C.
Both his adipose mass and his muscle mass decreased.
D.
He remained in nitrogen balance.
E.
He developed severe hypoglycemia.
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【简答题】低表面能材料具有_______,_______,_______,_______等特性。
【判断题】汽车轻量化要求一方面用高强度的材料，另一方面要用轻质材料，即强重比低的材料,而且，它还必须在适于成型、耐蚀，焊接、表面处理等方面都具有出色的性能。
A.
正确
B.
错误
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