题目内容

用K2Cr2O7滴定Fe2+,为消除Sn2+干扰,宜用:

A. 控制酸度法;
B. 配位掩蔽法;
C. 沉淀掩蔽法;
D. 氧化还原掩蔽法

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下列溶液中,可用直接法配制标准溶液的是:

A. NaOH溶液;
B. KMnO4溶液;
C. Na2S2O3溶液;
D. K2Cr2O7溶液

重铬酸钾测定铁时，可以在HCl介质中进行而不发生诱导反应。

A. 对
B. 错

Let us take a moment of the time just to pay tribute and 1____to the person called MOM though some may not say it openly to their mother. There’s no substitute for her. 2_ every single moment. Though at times she may not be the best of friends, she may not _3_ your thoughts, she is still your mother!She will be there for you; to listen to your woes, your brags, your 4, etc. Ask yourself “Have you 5_ enough time for her, to listen to her ‘blues’ of working in the kitchen, her 6_?”Be tactful, loving and still show her due 7___, though you may have a different view from hers. Once gone, only fond _8 of the past and also regrets will be left.Don’t 9 ed the things closest to your heart. Love her more than you love yourself. Life is 10____ without her.

可实现金属零件的激光立体成形和高性能激光修复的技术类型是

A. EBSM
B. LSF
C. EBF3
D. SLM