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【单选题】
A dog enthusiast took home two puppies from the dog shelter. He fed one of the puppies super-premium canned dog food, while he fed the other a generic brand from the grocery store. The dog fed on the generic brand gained weight twice as fast as the dog fed the super-premium brand. Because of the difference in these results, the dog enthusiast concluded that the generic brand actually provided nutrition superior to that of the super-premium brand. Each of the following, if true, would weaken the evidence for the dog enthusiast's conclusion except for which of the following?A.
A dog will sometimes gain more weight when eating inferior-quality food because he must eat more of it to obtain the nutrients he needs.
B.
The dogs were of mixed breeds and appeared to be descended from dogs of different sizes.
C.
Both dogs ate all of the food given to them at each serving.
D.
The dog enthusiast did not give the two dogs equal amounts of their respective foods.
E.
The dog who received the super-premium dog food suffered from a digestive system disorder that hindered his growth.
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【简答题】看图答题 1 、假想用剖切平面将机件的某处切断,仅画出断面的图形,称为 图。 2 、一张完整的零件图应该包括 、 、 、 。 3 、零件图采用了 、 视图绘制零件。 4 、Ф45K6段轴上键槽的长度为 mm , 宽度为 mm
【多选题】关于经营杠杆系数，下列说法正确的有( )。
A.
其他因素不变时，固定成本越大，DOL越大
B.
当固定成本趋于0时，DOL趋于1
C.
在其他因素一定的条件下，产销量越大，DOL越小
D.
DOL同固定成本成反比
【单选题】关于经营杠杆系数,下列说法不正确的是( )。
A.
其他因素不变,产销量越小,DOL系数越大
B.
其他因素不变,固定成本越大,DOL系数越小
C.
固定成本趋近于0时,DOL系数趋近于1
D.
DOL系数越大,反映企业的风险越大
【简答题】小华吃早餐大约需要15( )。
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