There are two walls in eduation. One is visible walls of the builiding seperating the school from real lives; the other is invisible walls between disciplines.
举一反三
- The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.
- Between the outside wall of glass and the two inside walls of glass, there is ______. A: an empty space B: another huge wall C: a triple-glazed wall
- It has 2 walls: the inner and the outer. ______ these walls, there is a vacuum to keep the liquid at a constant temperature.
- According the passage, what is one disadvantage of skyscrapers that have mirrored walls?
- These walls ___ stone.