A flame screen ______.A.permits the passage of vapor but not of flameB.prevents the passage of flammable vaporC.prevents inert gas from leaving a tankD.permits vapors to exit but not enter a tank
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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单选题A flame screen（）.Apermits the passage of vapor but not of flameBprevents the passage of flammable vaporsCprevents inert gas from leaving a tankDpermits vapors to exit but not enter a tank
单选题Vapor given off by a flammable liquid will burn when ignited provided（）Athe vapor and air mixture is too richBit is mixed with certain proportions of airCthe vapor is too little compared to the airDit is of heavy toxicity
单选题The purpose of the flame in flame atomic-absorption spectroscopy is to（）APurify the sampleBDesolvate and atomize the analyte atoms in a sampleCExcite the analyte atomsDIonize the analyte atoms
单选题What is the main difference between the information displayed on the dspload and the dsptrkutl screens？（）AThe dspload screen is for all trunks； the dsptrkutl screen is for one trunkBThe dspload screen shows the expected traffic； the dsptrkutl screen shows actual trafficeCThe information on the dspload screen never changes； the dsptrkutl screen is dynamicDThe dspload screen shows historical information； the dsptrkutl screen shows current information
单选题The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the（）.Aprecipitation pointBvapor pointCdew pointDabsolute humidity
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单选题Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.AnitrogenBoxygenCcarbon dioxideDwater vapor
单选题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（）.Aflame arrestorBflame screenCdetonation arrestorDdetonation blocker