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【单选题】
由组距式数列计算算术平均数时,用组中值代表组内变量的一般水平有一个假定条件,即()A.
各组的次数必须相等
B.
各组变量值必须相等
C.
各组变量值在本组内均匀分布
D.
各组必须是封闭组
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皮皮学刷刷变学霸
举一反三
【单选题】As Americans are called Uncle Sam, British are called ______.
A.
Henry Bull
B.
John Bear
C.
John Bull
D.
John Bear
【单选题】As America is to Uncle Sam, so England is to ______.
A.
John Bull
B.
John Bear
C.
Henry Bull
D.
Henry Bear
【简答题】完形填空。 John and Henry studied in the same school. John lived in fear of Henry-every day he gave his lunch money to Henry, but Henry still beat (揍) him up. He said that if John told anyone he would beat...
【简答题】John and Henry studied in the same school. John lived in fear of Henry — every day he gave his lunch money to Henry, but Henry still beat (揍) him up. He said that if John told anyone he would beat him...
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