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【单选题】
两组数据的秩和检验和t检验相比，其优点是A.
计算简便
B.
检验假设合理
C.
检验效能高
D.
抽样误差更小
E.
对数据分布不做限制
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举一反三
【简答题】We don't know how to do it. You can be sure, as I said before, people were very curious, and this situational humility combined with curiosity creates a sense of psychological safety that allows you t...
【单选题】5岁男孩,右下第一乳磨牙低于颌面3mm,右下第二乳磨牙近中倾斜,X线片示右下第一乳磨牙牙根无吸收,牙周膜间隙消失 处理方法
A.
不做处理,观察
B.
做阻萌器阻挡对胎
C.
做预成全冠,恢复咬合
D.
拔除,做功能保持器
【单选题】It's very stupid ___________ you to buy the useless machine ___________ 2000 dollars.
A.
for; to
B.
of; for
C.
for; at
D.
for; for
【单选题】It's very stupid _____ you to laugh ______ your sister when she is in trouble.
A.
of; to
B.
for; to
C.
or; at
D.
of; at
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