问题
选择题
American Indians________about five percent of the US population.[ ]
A. fill up
B. bring up
C. make up
D. set up
答案
答案：C
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American Indians________about five percent of the US population.[ ]
A. fill up
B. bring up
C. make up
D. set up
答案：C
2NH
3↑+H2O+SO2↑
2CO2
Si+2CO↑
N2O+ 2H2OE．CaCO3 + CO2+ H2O=Ca(HCO3)2