On a vessel, a CO2 extinguisher is checked by ______.A.reading the gage pressureB.weighing the extinguisherC.discharging a small amount of CO2D.seeing if the seal has been broken

On a vessel, a CO2 extinguisher is checked by ______.

A.reading the gage pressure

B.weighing the extinguisher

C.discharging a small amount of CO2

D.seeing if the seal has been broken


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调用()方法可以选中单选按钮。A.attr("checked","checked")B.attr("checked",false)C.attr("checked")D.removeAttr("checked")