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【单选题】
设单因素方差分析中误差差平方和为125.00，水平差平方和为375，那么总离差平方和为（）A.
250
B.
125
C.
375
D.
500
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反馈参考答案：
举一反三
【单选题】How did Miss Stewart choose the right trade fair?
A.
According to the reputation of the trade fair.
B.
According to the scale of the trade fair.
C.
According to the information from the fair organisers.
【单选题】How did Miss Stewart choose the right trade fair?
A.
According to the reputation of the trade fair.
B.
According to the scale of the trade fair.
C.
According to the information from fair organizers
【单选题】How did Miss Stewart choose the right trade fair?
A.
According to the reputation of the trade fair .
B.
According to the scale of the trade fair
C.
According to the information from the fair organizers.
【单选题】根类中药横切面观 : 1 无草酸钙结晶 2 韧皮部有纤维束与筛管群交替排列 3 近栓内层处有时可见石细胞及管状木栓组织 4 韧皮射线弯曲 , 有裂隙 此药材可能是
A.
甘草
B.
当归
C.
黄芪
D.
黄芩
E.
茜草
【单选题】根类中药横切面观:1无草酸钙结晶,2韧皮部有纤维束与筛管群交替排列,3近栓内层处有时可见石细胞及管状木栓组织,4韧皮射线弯曲,有裂隙 此药材可能是
A.
甘草
B.
当归
C.
黄芪
D.
黄芩
E.
白头翁
【简答题】自行车的中轴是[填空(1)]轴，而前轮轴是[填空(2)]轴，后轮轴是[填空(3)]轴。
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