灭火后,关闭灭火器上的阀门( )
A.After you put out the fire, close the valve on the fire extinguisher. B.After you extinguish the fire, close the valve on the fire extinguisher. C.After the fire is out, close the valve on the fire extinguisher.正确答案B
灭火后,关闭灭火器上的阀门( )
A.After you put out the fire, close the valve on the fire extinguisher. B.After you extinguish the fire, close the valve on the fire extinguisher. C.After the fire is out, close the valve on the fire extinguisher.正确答案B