The following pressure gauge range selection requirements are correct ( ).

The following pressure gauge selection requirements are incorrect ( ).

When starting the centrifugal pump, the following operation error is ( ).

When starting the centrifugal pump, the pump outlet valve should be closed, otherwise it is easy to occur ( ) phenomenon.

When starting the centrifugal pump, should ( ).

The outlet valve that must be closed when starting the pump is ( ).

During switching centrifugal pump operation, the standby pump should be started before ( ).

Switch centrifugal pump operation, start standby pump after normal should ( ).

Switch centrifugal pump operation, switch normally should after ( ).

Switching centrifugal pump operation, before starting backup pump should ( ).

Must ( ) when the centrifugal pump stops pumping.

After the centrifugal pump stops pumping, the following practice is wrong ( ).

The wrong operation of the slag pump when the pump is off pump standby is ( ).

The wrong operation of the slag pump when the pump is off pump standby is ( ).

Start metering pump, operation wrong is ( ).