作者theodore ( 一直在找一个人)
看板Chemistry
标题请教一题分析化学考古题!!
时间Sat Jul 8 00:50:14 2006
for a titration suppose that the standard deviation
in reading the buret is 0.02ml for the initial
and 0.02ml for the final reading
and that the standard deviation in location the end point is 0.04ml.
from this information
calculate the overall standard deviation for the titration
a)0.024
b)0.0024
c)0.049
d)0.08
e)0.28
答案是e
可是我不知道为什麽 有没有高手可以解释一下!!
谢谢
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1F:→ theodore:可以推文或丢水球给我!! 07/08 00:51
2F:推 nestealee:0.02^2+0.02^2+0.04^2=0.0024,0.0024开方得答案 07/08 21:27
3F:推 theodore:可是解答的答案给E耶!! 07/09 18:23
4F:推 nestealee:答案只有ACD可选...题干有效位数都是到小数点第二位 07/10 14:19