This fire extinguisher is to be used o

1、This piece of music is to be played（）b

This piece of music is to be played（）by the piano.AownBsingleCsoloDitself

2、（）is used to protect goods not to be d

（）is used to protect goods not to be deteriorated like food and medicine.ApackagingBGreen PackagingCVacuum packagingDSpecial packaging

3、To extinguish an electrical fire, you

To extinguish an electrical fire, you should use （）.Amechanical foamBchemical foamCcarbon dioxideDsoda acid

4、Pan-Pan is to be used to announce（）.

Pan-Pan is to be used to announce（）.Aa distress messageBan urgency messageCa safety messageDa message of SMCP

5、COSPAS-SARSAT is intended to be used f

COSPAS-SARSAT is intended to be used for（）.Adistress alertingBlocating 406mhz EPIRBsCstoring distress signalDA and B

6、The （） is used to measure the volume o

The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.AflowmeterBviscometerCmicrometerDfeeler