The crankcase can not be opened （）the parts have been cooled down.
举一反三
- It is necessary to make sure that there are no loose parts left in the crankcase before using the turning gear because ______. A: some parts of the running gear have been dismantled B: during dismantling work, lubrication lines and orifices are sealed<br/>off C: loose parts jammed in the crankcase are likely to cause damage D: pipes are relieved of pressure before the repair work
- Some of your suggestions have been __________, but others have been turned down as they are not workable.
- Fill in the blank with the word given below. Change the form where necessary. Each word can be used only once.5. Some of your suggestions have been _____, but others have been turned down as they are not workable.
- With the development of science and technology, the prices of TV sets have ___. A: gone down B: been gone down C: brought down D: been gone up
- （）from other continents for millions of years, Australia has varieties of species which can hardly be found in other parts of the world. A: Being separated B: Having been separated C: To be separated D: To have been separated