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In combustion of coal, gas is not relea...

In combustion of coal, _______ gas is not released.
A. `SO_2`
B. `NO_2`
C. `NH_3`
D. `CO_2`

A

A. `SO_2`

B

B. `NO_2`

C

C. `NH_3`

D

D. `CO_2`

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