利用 异氰酸酯基 与过量的 二正丁胺 反应生产脲，再用盐酸滴定过量的二正丁胺来定量计算异氰酸酯基的含量。 R-NCO+ (C4H9)2NH→RNHCON（C4H9)2. （C4H9)2NH+HCL→（C4H9)2NH·HCL. ② 测定仪器及试剂. 二正丁胺、 溴甲酚绿 、 甲苯 、 异丙醇 、移液管、酸式滴定管. ③ 标准溶液的配置. A）溴甲酚绿指示剂:0.1g溴甲酚绿溶于100 mL体积分数20 %乙醇中; B）0.1 mol/L 二正丁胺-甲苯溶液: 将12.9 g二正丁胺溶于甲苯中, 移 …

This is a study guide for the NCO test that the USMC created to standardize the minimum knowledge requirement for an infantry NCO

Online preparation mock tests for National Cyber Olympiad (NCO), IAIS Computers, International informatics Olympiad (iIO), BIIO, ICO, UCO.

The official SOF NCO Sample Papers With Solutions for Classes 1 to 10, Attempt Sample Papers and know the exact NCO exam pattern. Download Now

Officer 2020 Strategy (NCO 2020) provides vision and guidance on ends, ways, and means for developing NCOs that exercise Mission Command while planning, preparing, executing, and assessing...

Get National Cyber Olympiad (NCO) Mock Tests, for the students of Class 1 to 8, The Official SOF Olympiad Preparation Portal

NCO common core competency topics support the four Army Learning Areas, include subjects that are sequential and progressive, and build on skills, knowledge, and abilities of every NCO by...

Army has Soldiers, especially noncommissioned oficers (NCOs), with the proficiencies needed to succeed under a myriad of dynamic situations. One of the keys to the Army’s Talent Management Strategy...

The official NCO Sample Papers With Answers for Classes 1 to 10. Attempt Sample Papers to get familiar with the test format and content. Also check performance reports and comparative analysis.

This website is a preparation guide for Army Soldier of the Month, NCO of the Month, and promotion boards. There is a substantial, relevant sampling of Army promotion board questions. Since the promotion board and competitive boards share many similarities, most questions experience significant overlap.