Natural gas is mainly made up of methane and other hydrocarbon gases.

The following words are regarded as derivation formation except for:? transmitter|hydrocarbon|biomedical|breakthrough

Often associated with crude oil, natural gas is principally made up of_______ and other hydrocarbon gases.

The “wet” in the wet gas does not mean that a gas is wet with water but refers to the hydrocarbon liquid that condenses at surface conditions.

The key point in the sketchy regional investigation should be to study the problem of . A: basin-forming B: hydrocarbon generation C: the problem of reservoir formation

中国大学MOOC: 油田气成分component： 甲烷methane、 乙烷ethane， 60～90％ 丙烷propane、丁烷butane、戊烷pentane和重烃heavy hydrocarbon， 10～40％

Parathion has which one of the following characteristics? ( ) A: It<br/>is inactivated by conversion to paraoxon B: It<br/>is less toxic to humans than malathion C: It is more persistent in the environment than DDT (dichlorodiphenyltrichloroethane, halogenated hydrocarbon insecticides) D: It<br/>is poorly absorbed through skin and lungs E: If<br/>treated early, its toxicity may be partly reversed by pralidoxime