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")