( ) should be used before starting the metering pump.

The metering pump should be turned off slowly after starting normally ( ).

Pump flow regulator should be set to ( ) before starting metering pump.

What is wrong with the following statement about the operation of the stop-metering pump is ( ).

The following is correct about the operation of the shutdown metering pump ( ).

Flow regulator should be set to ( ) after stopping metering pump.

The following about the operation of the stop metering pump is wrong ( ).

Vacuum pump before opening the pump the wrong operation is ( ).

If the following conditions occur after the vacuum pump starts, do not need to stop the pump immediately is ( ).

If the following situation occurs after the vacuum pump starts, do not need to stop the pump immediately is ( ).

Vacuum pump after opening the pump check for the wrong operation is ( ).

Vacuum pump stop pump operation, the following is correct ( ).

Vacuum pump stop pump operation, the following is wrong ( ).

Vacuum pump stop pump operation, the following practice is wrong ( ).

When the vacuum pump is operating normally, the error is ( ).