单项选择题

A．Lifted heavy box.
B．Put hundreds of bottles and tins and packets on shelves.
C．Lifted bricks.
D．Lifted bottles and boxes.
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单项选择题
The major difference between oxidation and fire is that ______.
A．their burning velocities differ in rate
B．oxidation is a chemical reaction while fire is a physical reactionp
C．oxidation does not create heat
D．they occur at different temperatures
单项选择题
Rocker fuels are more explosive than methane gas because of ______.
A．the temperature at which combustion takes place
B．the degree of oxidation accomplished by the combustion process
C．the presence of inhibitors
D．the great burning velocity
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