题目内容
（请给出正确答案）
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
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更多“A flame screen ______.A.permit…”相关的问题
What is acceptable flame screening ________．
A.A fitted single brass screen of 10 x 10 mesh
B.A fitted stainless steel screen of 30 x 30 mesh
C.A fitted single stainless steel screen of 15 x 15 mesh
D.Two fitted brass screens of 10 x 15 mesh spaced 1/2 inch apart
A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a ______.
A.flame arrestor
B.flame screen
C.detonation arrestor
D.detonation blocker
A.C. miniata ‘Flame’
B.C. miniata cv. Flame
C.C. miniata cv. Flame
D.C. miniata ‘Flame’
The purpose of the flame in flame atomic-absorption spectroscopy is to( )
A．purify the sample
B．desolate and atomize the analyte atoms in a sample
C．excite the analyte atoms
D．ionize the analyte atoms
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