例句與造句

1. This unit may be better called " methylene bridge " or " methanediyl " to distinguish it from the doubly bonded methylene group.
2. Use of a sulfoxonium allows more facile preparation of the reagent using weaker bases as compared to sulfonium ylides . ( The difference being that a sulfoxonium contains a doubly bonded oxygen whereas the sulfonium does not . ) The former react slower due to their increased stability.
3. The "'pyramidalization angle " "'? " ( "'b "') is defined as the angle between the plane defined by one of the doubly bonded carbons and its two substituents and the extension of the double bond and is calculated as:
4. A compound containing a carbonyl group ( C = O ) is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl (  " OH ) group, C = C-OH . The keto form predominates at equilibrium for most ketones.
5. It's difficult to find doubly bonded in a sentence. 用doubly bonded造句挺難的