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【单选题】
若正常成人的血铅含量X近似服从对数正态分布，拟用300名正常人血铅值确定99%参考值范围，最好采用公式以下哪种计算（其中Y=logX）（）
A.
±2.58S
B.
+2.33S
C.
log -1 （ ±2.58S y ）
D.
log -1 （ +2.33S y ）
E.
log -1 （ +1.96S y ）
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17.5%    
B.
15.0%    
C.
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D.
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±0．5％
B.
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C.
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【单选题】片重在0.3g或0.3g以上的片剂的重量差异限度为
A.
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B.
0.07
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【单选题】做片剂的重量差异检查时，若平均片重小于0.3G，则重量差异限度为
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A.
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