A flame screen ______.
A.permits the passage of vapor but not of flame
B.prevents the passage of flammable vapor
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank
正确答案：A
防火网允许蒸汽通过但不允许火焰通过
Aflamescreen______Apermitsthepassageofvaporbutnot
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