постоянный

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 ...