作者katiekatie (小白豬)
看板NTUE_Nse97
標題Re: [閒聊] 好心人士..
時間Sun Oct 8 14:12:07 2006
※ 引述《vickybear68 (熊)》之銘言：
: 有沒有哪位好心人士可以把禮拜三要交的分析作業題目po在板上呀!
: 我深怕我禮拜二回家會很晚了...
: 作業來不及寫...
: po文可以賺逼幣唷!!
: 幫幫我吧!!!
: 一想到要回台北就頭痛呀!!
: 塞塞塞塞塞.......= =
5-8:A method of analysis yields weights for gold that are low by 0.4mg.
Calculate the percent relative error caused by this uncertainty if
the weight of gold in the sample is
*(a)700mg.
(b)450mg.
*(c)250mg.
(d)40mg.
5-9:The method described in Problem5-8 is to be used for the analysus of
ores that assay about 1.2% gold. What minimum sample weight should be
taken of the relative error resulting from a 0.4-mg loss is not to exceed
*(a)-0.2%
(b)-0.5%
*(c)-0.8%
(d)-1.2%
5-11:A loss of 0.4 mg of Zn occurs in the course of an analysis for that
element. Calculate the percent relative error due to this loss if the
weight of Zn in the sample is
*(a)40mg
(b)175mg
*(c)400mg
(d)600mg
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1F：→ katiekatie:閒著也是閒著~~~我來當ㄧ下好心人士 10/08 14:13
2F：推 conective:偷推 10/08 14:47
3F：推 magic66:a和c前面怎都有*號 10/08 15:25
4F：推 KEBT:就是後面有答案的意思 10/08 15:29
5F：→ KEBT:好心人士...可以再給課本後面的答案嗎?!拜託!! 10/08 15:30
6F：推 kimkuo:推 打題目很辛苦 10/08 16:29
7F：推 vickybear68:謝謝好心人士!! 10/08 18:17
8F：推 flyingangela:這是一定要推一下的啦~~~真是好心人:p 10/08 19:12
9F：推 blackjack0s:原來朱姐是好人...(筆記) 10/08 20:03
10F：推 jkychen: 原來朱姐是好人...(筆記) 10/09 00:10