The purpose of the vacuum test of the decompression tower before commencement is ( ).

The medium for cold reflux at the top of the atmospheric tower is ( ).

In order to ensure that the initial top and the normal top can establish the top reflux and control the top temperature when startup, the unit should be ( ) before startup.

In order to ensure that the initial top and the normal top can establish the top reflux when startup, control the temperature of the top of the tower, the unit can be used for gasoline receivable before startup.

Unit collect gas before startup, the following statement is wrong ( ).

Before steam opening, vacuum water seal tank ( ) is used to seal oil for machine pump.

The requirements for sealing oil do not include ( ).

The following should not be used as sealing oil components are ( ).

The action of sealing oil does not include ( ).

What is not true about collecting distillates before startup is ( ).

Distillate collection before startup is in preparation for ( ) building the top of the tower reflux.

The purpose of collecting distillates before the unit starts is ( ).

In order to ensure that the top reduction can establish the top reflux while startup, the unit should be ( ) before starting.

Unit open loop is for ( ).

When the unit has an open cycle, the pump that is not on is ( ).