A flame screen ______.A.permits the passage of vapor but not of flameB.prevents the passag

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.miniata cv. Flame

D.C. miniata ‘Flame’

A.C. miniata ‘Flame’

B.C. miniata cv. Flame

C.miniata cv. Flame

D.C. miniata ‘Flame’

A.C. miniata ‘Flame’

B.C. miniata cv. Flame

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

A.火焰

B.奴隶

C.石灰

D.湖泊

A.flame

B.spark

C.glow

D.blaze

Flame screens are used to ______.

A.contain flammable fumes

B.protect firefightiers from flames

C.prevent flames from entering tanks

D.keep flame and sparks from getting out of an engine’s exhaust system