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问题 单项选择题

对10名25岁以上的山区健康男子测量脉搏次数（次／分），用t检验与全国正常男子资料进行比较，按a=0.05的检验水准，自由度为（）。

A．V=9

B．V=19

C．V=8

D．V=20

E．V=18

答案

参考答案：B

选择题

青少年适量补充“钙”，可以有效预防

A．夜盲症

B．贫血

C．智力低下

D．佝偻病
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