of all organic chemical is obtained from crude oil and natural gas.
A: 80%
B: 99%
C: 70%
D: 79%
A: 80%
B: 99%
C: 70%
D: 79%
举一反三
- Organic chemicals mainly come from oil, natural gas, and . A: metal B: air C: water D: coal
- Often associated with crude oil, natural gas is principally made up of_______ and other hydrocarbon gases.
- When the crude oil is obtained from the field, it is taken to __________ to be treated. The commonest form of treatment is heating. A: the corporations B: the refineries C: the pipelines
- In almost all chemical-process plants, heat is ______ by burning of fossil fuels-coal, oil, or natural gas. A: transformed B: conducted C: transferred D: generated
- Generally speaking, effective ingredients extracted from natural minerals, animals or plants, as well as drugs obtained by chemical synthesis or biosynthesis are collectively known as chemical drugs.