中国大学MOOC: Use a to clean the surface of the oil.
举一反三
- Use a to clean the surface of the oil. A: colander B: spider C: skimmer D: cloth
- If the abiotic theory is true, oil prices will soar and there will be competition for oil even war to solve the conflict caused by oil.
- The use of sinking and dispersing chemical agents for removal of surface oil is（）. A: the most common method B: too expensive for common use C: generally safe to sea life D: authorized only with prior approval of the governmental On-Scene Coordinator
- _____ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.
- By ( ), with the imported oil accounting for 80%, China is almost becoming a country totally dependent on imported oil.