题目内容
（请给出正确答案）
A、little hydrogen
B、little oxygen
C、energy
D、waste
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The following beam with isosceles trapezoid (等腰梯形) cross section is under pure bending M. B = 3b, h = 2b, then
= ().
A、5/7
B、4/7
C、2/3
D、1/2
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
A.scream
B.flame
C.steam
D.blame
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
Too much air in the furnace of an oil-fired boiler would be indicated by _____.
A.yellowish flame
B.golden yellow flame
C.white flame
D.brilliant white flame
As for a oil-fired boiler too much air would indicated by _____.
A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame
A、Stabilizers
B、Flame retardants
C、Impurities
D、Colorants
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