quaternary

英 [kw?'t??n(?)r?] 美[kw?'t?n?ri]

暢通詞匯

復(fù)數(shù):?quaternaries;

quaternary (adj.): early 15c., "consisting of four parts," from Latin quaternarius "of four each, containing four," from quaterni "four each, by fours," from quater "four times," related to quattuor "four" (see four). Also as a noun, "the number four" (mid-15c.), from Latin quaternarius.

In geological sense, attested from 1843 in English, proposed 1829 by French geologist Jules Pierre Fran?ois Stanislas Desnoyers (1800-1887) as name for "the fourth great epoch of geological time," but because it comprises only the age of man, and the other epochs are many hundred times longer, not all accepted it.

1. Cationics are usually quaternary ammomium salts.: 陽(yáng)離子表面活性劑通常為季銨鹽類(lèi).

3. Moreover , there is a chiral quaternary carbon in the 1 - hydroxyethylidenediphosphonic ( hedp ) ligand.: 證實(shí)1-羥基乙叉 -1,1-二膦酸配體 ( hedp ) 中的季碳為手性碳原子.

4. China's Datong group of volcanic Quaternary volcanic one of the group.: 大同火山群是我國(guó)第四紀(jì)火山群之一.

5. Iron - nickel - phosphorus - boron quaternary alloy electroless plating on copper panel was described.: 在銅基上化學(xué)鍍鐵 - 鎳 - 磷 - 硼四元合金.

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