整点票币应达到点准、挑净、墩齐、捆紧、（）五项质量标准要求。

A、无虫蛀

B、无差错事故

C、分类

D、盖章清楚

How does foam extinguish an oil fire?（）

A.By cooling the oil below the ignition temperature

B.By removing the fuel source from the fire

C.By excluding the oxygen from the fire

D.By increasing the weight of the oil