单项选择题

A steady flame in a gas burner is the result of ______.

A．a burning velocity equal to the combustion wave
B．fuel being supplied at the same rate as the combustion wave
C．fuel being supplied at a higher rate than that of the burning velocity
D．a low combustion wave
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单项选择题
Rocket fuels are more explosive than methane gas because of ______.
A．the temperature at which combustion takes place
B．the degree of oxidation accomplished bp the combustion process
C．the location of the combustion
D．the greater burning velocity
单项选择题
An attempt on the part of the author of this passage to give a more informal tone to his writing occurs in ______.
A．paragraph 2
B．paragraph 4
C．paragraph 5
D．paragraph 7
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