Methyl Ethyl Ketone
CAS：78-93-3
Cyclohexanone
CAS：108-94-1
Acetone
CAS：67-64-1
Acetic Acid
CAS：64-19-7
Ethyl Acetate
CAS：141-78-6
Toluene
CAS：108-88-3
Benzene
CAS：71-43-2
Ethanol
CAS：64-17-5
Methanol
CAS：67-56-1
2-butanone methyl ethyl ketone in Malaysia
2 - Wikipedia
In pre-1972 Indonesian and Malay orthography, 2 was shorthand for the redupliion that forms plurals: orang (person), orang-orang or orang2 (people).[citation needed] In Astrology, Taurus is the second sign of the Zodiac.For Pythagorean numerology (a pseudoscience) the nuer 2 represents duality, the positive and negative poles that come into balance and seek harmony.
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2 (nore) Wikipédia
2 est un nore premier palindrome et permutable. 2 est l''un des 15 nores premiers super-singuliers. 2 est le plus petit nore premier non brésilien. 2 est le 4e nore de Fibonacci, noté F 4 (c''est donc un nore premier de Fibonacci) 2 est le 1er nore de Lucas, noté L 0. 2 est le 3e nore de Pell.
Pythonnumpy：print(a[0::2])、a[::2]、[:,2]、[1:,-1:] …
2019921 numpy [ ] , python 0 -1 ： start:stop:step ：
Square root of 2 - Wikipedia
The square root of 2 (approximately 1.4142) is a positive real nuer that, when multiplied by itself, equals the nuer 2.It may be written in mathematics as or /, and is an algebraic nuer.Technically, it should be called the principal square root of 2, to distinguish it from the negative nuer with the same property.
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2 - Wiktionary
2022125 2 ( prev 1, next 3 ) The cardinal nuer two. A digit in the decimal system of nuering, as well as octal, and hexadecimal. A rotational symmetry element in the Hermann-Mauguin notation, indiing a rotation over π (twofold axis). ( mathematics) The two-element Boolean algebra, two-point discrete space or a ( canonical) two-element set.
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Beijing No.2 Middle School 1724 (2003) () “”“、、、”
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