Before starting the steam ejector to vacuum, the following operation error is ( ).

The tower does not condense too much, the vacuum system load ( ).

A complete vacuuming system generally consists of ( ).

The medium used for vacuuming the decompression tower before construction is ( ).

When the steam opening process is used for vacuuming, make sure ( ).

When vacuuming before startup, should ( ).

When vacuuming test before startup, the speed of vacuuming should not be too fast, otherwise it will ( ).

Before starting the steam injector to vacuum, the following operations are correct ( ).

The furnace must be done ( ) before ignition of the heating furnace.

Before firing the furnace, ( ) need not be changed into the appropriate medium.

When the furnace starts ignition, the following flue baffle adjustment operation is correct ( ).

Before firing the heater, you must make sure ( ).

What is wrong with the following statement about furnace purging before commencement is ( ).

Standard for furnace purge before ignition: combustible gas content less than ( ).

The following furnace purge operation is wrong by ( ).