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【单选题】
下列叙述错误的是 ：A.
精密度好是准确度高的必要条件
B.
精密度好则准确度一定会高
C.
精密度是指在相同条件下测定结果的再现程度
D.
平均偏差和标准偏差都可以用来衡量一组数据的精密度的优劣，但后者更好
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【单选题】Many Cherokees died on their way to their new home mainly because ______.
A.
they were not willing to go there
B.
the government did not provide transportation
C.
they did not have enough food and clothes
D.
the journey was long and boring
【单选题】室间隔缺损的患儿有时出现声音嘶哑,最常见的原因为
A.
左心室增大，压迫喉返神经
B.
肺动脉扩张，压迫喉返神经
C.
左、右心室增大，压迫喉返神经
D.
右心室增大，压迫喉返神经
E.
左心房增大，压迫喉返神经
【简答题】Tom and Mike were good friends. 1 , sometimes they were not. But some of their classmates said they were like brothers. One day they went out for a walk together. 2 and they went into a restaurant to ...
【单选题】室间隔缺损的患儿有时出现声音嘶哑,最常见的原因为
A.
左心室增大,压迫喉返神经
B.
肺动脉扩张,压迫喉返神经
C.
右心室增大,压迫喉返神经
D.
左、右心室增大,压迫喉返神经
E.
左心房增大,压迫喉返神经
【单选题】室间隔缺损的患儿有时出现声音嘶哑，最常见的原因为
A.
左心室增大，压迫喉返神经
B.
肺动脉扩张，压迫喉返神经
C.
左、右心室增大，压迫喉返神经
D.
右心室增大，压迫喉返神经
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