单项选择题

A steady flame in a gas range 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 burning velocity
D．a free flowing supply of air from the openings in the head of the burner

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热门试题

单项选择题

The relationship between the salesman and the customer is ______.

A．one of selling techniques which could express the cultural differences
B．based on mutual trust in some countries,
C．very important to the selling process
D．all of the above

单项选择题

When designing the packaging, you should concern about ______.

A．the number of items to be put in a package
B．the taboo of a certain culture
C．the size and the color
D．all of the above