A. | B. | C. | D. |
A.室温下,配制2.5mol/L的NaHCO3溶液 |
B.爆炸最强烈的坑道气中甲烷的体积分数为10.5% |
C.用1molSO2气体与足量氧气反应放出的热量为98.35KJ |
D.与CaO作用直接制Ca(NO3)2·8H2O所用硝酸的质量分数为50% |
A.①②④⑥ |
B.②④⑤ |
C.①②③④ |
D.④⑤⑥ |
A.1:1:1:1 |
B.3:3:2:3 |
C.5:5:5:4 |
D.无法确定 |
A.2ω1=ω2 |
B.2ω2=ω1 |
C.ω2>2ω1 |
D.ω1<ω2<2ω1 |
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