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问题 单项选择题 A1型题

对儿童少年进行生长发育调查，调查前应对测量仪器进行（）

A.准确度的校准

B.精确度、灵敏度的校准

C.精确度的校准

D.精度的校准

E.灵敏度的校准

答案

参考答案：B

问答题

治心神不安，远志、石菖蒲常同用，二者性能主治有何不同

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选择题

A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he _____

for two years. [ ]

A. has been preparing

B. had been preparing

C. has prepared

D. prepares

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