The following that are not part of the centrifugal pump sound standard are ( ).

The following that are not part of the centrifugal pump sound standard are ( ).

Under the premise that the physical and chemical properties of the thermal insulation material meet the process requirements, the thermal insulation material of ( ) should be generally selected.

Under normal circumstances, when the media condensing point ( ) in the equipment and pipes, it should be insulated.

The insulation structure generally consists of insulation layers and ( ).

In general, equipment, pipelines and accessories should be insulated if the external temperature is higher than ( ).

The description of measuring temperature instruments in the following unit is applied incorrectly ( ).

The principle by which a thermocouple thermometer measures temperature is ( ).

What is wrong with the following statement about the types of temperature measuring instruments commonly used in atmospheric and vacuum installations is ( ).

What is wrong with the following statement about the principle of temperature measurement with a thermocouple thermometer is ( ).

What is wrong with the following statement about instruments commonly used in production to measure level is ( ).

The glass plate level gauge on the bubble liquid surface belongs to ( ).

When using the pressure method to measure the level of an open container, the level depends on ( ).

The double flange level gauge on the liquid surface at the bottom of the decompression tower belongs to ( ).

What is wrong with the following statement about pressure gauge replacement is ( ).