I
• A structural member of uniform cross-section ...
II
см. тж. неизменный ; оставаться неизменным ; поддерживать постоянное напряжение
• The pressure and temperature have been presumed to be fixed .
• The composition is fixed and the two variables are temperature and pressure.
• A steady difference of potential exists across ...
III
• This assures complete control of rods and caps at all times .
• In areas of sustained shortage of water ...