The thermal efficiency of flue gas sampling analysis is highest when the heating furnace is in the ( ) state.

The exact location of the furnace flue gas sample is ( ).

The following that are not part of the flue gas analysis item are ( ).

The choice of starter tower is related to ( ) and process flow.

In order to make the content of reforming material ( ) qualified, the atmospheric and vacuum distillation unit should be equipped with a preliminary distillation tower.

The initial top of the atmospheric and vacuum distillation unit can be made of ( ) raw material.

Setting the initial distillation tower will cause ( ).

The initial top and normal top of the atmospheric and vacuum distillation unit can be used as ( ).

Initial top, regular top gasoline can be used as ( ).

The initial top and normal top of the atmospheric and vacuum distillation unit can be used as ( ).

When initial top and normal top gasoline is used as ethylene cracker, the index of control is ( ).

Vacuum side line of atmospheric and vacuum distillation unit can be used as ( ) raw material.

Vacuum side line of atmospheric and vacuum distillation unit can be used as ( ) raw material.

Vacuum side line of atmospheric and vacuum distillation unit can be used as ( ) raw material.

Vacuum side line of atmospheric and vacuum distillation unit can be used as ( ) raw material.