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【单选题】
一个玉米品种的10个果穗长度的平均数和标准差分别是20和1.247，那么其变异系数是：A.
6.24
B.
6.24%
C.
16.04
D.
16.04%
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【多选题】In colonial times women provided health care for their families and neighbors. Doctors were often not __1__ , and at that time they had not learned to cure many of the illnesses that we often go to a ...
A.
also
B.
currently
C.
delivering
D.
treat
E.
readily
F.
reduced
G.
cure
H.
regulate
I.
male
J.
available K. female L. schooling M. accepting N. approachable O. declined
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【简答题】In colonial times women provided health care for their families and neighbors. Doctors were often not __1__ , and at that time they had not learned to cure many of the illnesses that we often go to a ...
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