K2Cr2O7标准溶液的浓度为0.02000mol·dm-3,则它对Fe,Fe2O3,FeSO4·7H2O的滴定度分别为______g·cm-3,______g·cm-3,______g·cm-3。
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The fact _______ his health is bad is not true.
A. which
B. that
C. as
D. what
碘量法测铜时,由于CuI沉淀强烈吸附I-,使结果______(偏高、偏低),所以在接近滴定终点时,加入KSCN的作用是______。
在间接碘量法中,KI一般过量约4%的目的是______,______。 该法主要的误差来源是______。
The tellers in Mrs. Vaughts bank were told to ________.
A. explain why they could not pay out all accounts
B. pay out accounts as requested
C. make the depositors believe that the bank was stand
D. pay out money as slowly as possible