Pipelines are not （）
举一反三
- Crude oil transferred through the pipelines meets ______ of annual need of China.
- The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
- Why did some oil companies temporarily close some of their pipelines? A: Because there were no enough staff working. B: Because much of the equipment had been destroyed. C: Because those not in key positions could therefore leave the area. D: Because many pipelines had caught fire, thus threatening people there.
- 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
- Which of the following suits for energy-saving A: Making thermal insulation for cooling and heating pipelines B: Producing metal materials with mineral resource instead of metal scrapes C: Long distance transmission of electric power D: Using air conditioning system as much as possible