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Intermediate: 57-86: 4.0-5.0: Understands the main points of clear, standard input on familiar matters regularly encountered in work, school, & leisure. 51-60: B2: Upper Intermediate: 87-99: 5.5-6.0: Understands the main ideas of complex text or speech on both concrete and abstract topics, including technical discussions in his field of ...
B2 First, previously known as Cambridge English: First and the First Certificate in English (FCE), is an English language examination provided by Cambridge Assessment English (previously known as Cambridge English Language Assessment and the University of Cambridge ESOL examinations).
The Common European Framework of Reference for Languages: Learning, Teaching, Assessment, [1] abbreviated in English as CEFR, CEF, or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasingly, in other countries. The CEFR is also intended to make it easier for educational institutions ...
B-2 Spirit A U.S. Air Force B-2 Spirit flying over the Pacific Ocean in 2016 General information Type Stealth strategic heavy bomber National origin United States Manufacturer Northrop Corporation Northrop Grumman Status In service Primary user United States Air Force Number built 21 History Manufactured 1987–2000 Introduction date 1 January 1997 First flight 17 July 1989 ; 35 years ago ...
Blackburn B-2, a British biplane side-by-side trainer aircraft; Brantly B-2, a helicopter; Curtiss B-2 Condor, an American biplane bomber built before World War II; DFW B.II, a 1914 German aircraft; Euler B.II, a German Idflieg B-class designation aircraft; Farman B.2, a French Farman aircraft; Flanders B.2, a 1912 British experimental biplane
The lower the concentration of the gel, the larger the pore size, and the larger the DNA that can be sieved. However low-concentration gels (0.1 - 0.2%) are fragile and therefore hard to handle, and the electrophoresis of large DNA molecules can take several days. The limit of resolution for standard agarose gel electrophoresis is around 750 kb ...
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