While checking out the computer, the reservationsit will politely say:
A. How many nights would you like to stay in our hotel?
B. How many people will be in your party?
C. When will you arrive?
D. Could you hold the line for a moment, please? I’ll check if there is any room available for those days.
查看答案
在进行样品称量时，由于附近施工引起天平震动是属于
A. 系统误差
B. 偶然误差
C. 过失误差
D. 操作误差
精密量取50ml溶液，应选下列哪种仪器
A. 量筒
B. 量杯
C. 小烧杯
D. 移液管
称取无水碳酸钠0.232g，符合要求的称样量是
A. 0.232g
B. 0.2320g
C. 0.2315～0.2325g
D. 0.2316～0.2326g
分析测定中出现的下列情况，属于偶然误差的是
A. 滴定时所加试剂中含有微量的被测物质
B. 滴定管的最后一位读数偏高或偏低
C. 所用试剂中含干扰离子
D. 室温升高
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