题目内容

安装工业机器人的场所除操作人员外，其他人员可以靠近

A. 对
B. 错

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Effective practice is consistent, intensely focused, and targets content or weaknesses that lie at the edge of one's current abilities. So if effective practice is the key, how can we get the most out of our practice time?(1)Focus on the at hand.(2)Frequent with allotted breaks are common practice habits of elite performers.(3)Practice in your brain in __ detail.Effective practice is the best way we have of pushing our individual limits, achieving new heights, and maximizing our potential.[音频]

Fe3+，Al3+对铬黑T有

A. 封闭作用
B. 氧化作用
C. 沉淀作用
D. 僵化作用

实验室中用CaCO3标定EDTA溶液的浓度时，通常选用的指示剂是

A. 酚酞
B. 淀粉KI
C. 钙指示剂
D. 甲基橙

在pH=5.0的六次甲基四胺缓冲溶液中，用0.02000 mol/L的EDTA滴定同浓度的Pb2+，化学计量点时，pPb是[ pH=5.0时，lgaY(H)=6.4，lgK(PbY)=18.0 ]

A. 6.8
B. 7.2
C. 10.0
D. 13.2