一种定义
四种语言
One or two lockable drawers are usually sufficient for most purposes.
The first sketches or drawings document the results.
This section can be closed to maximise the drawing area.
It also supports convection processes with waste heat being extracted.
Air is extracted to create a vacuum in the mould cavity into which the moulding sand is fed.
Railless wheel and crawler units are often used on floor conveyor systems and extraction machinery.