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AIR IS COMBINATION OF NITROGEN AND OXYGEN…….IN PLA...
AIR IS COMBINATION OF NITROGEN AND OXYGEN…….IN PLACE BY GRAVITY.A....
DAP AN ON THI DAI HOC 57
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15. Air is combination of nitrogen and oxygen…….in place by gravity.
a. are holding b. being held
c. held
d. holding
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15.
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DAP AN ON THI DAI HOC 57