A.64.7% | B.65.7% | C.66.7% | D.67.7% |
35.5 |
36.5 |
40 |
71 |
4.0g |
6g |
A.90% | B.95% | C.80% | D.70% |
A.小苏打(NaHCO3) |
B.纯碱(Na2CO3) |
C.碳酸钙 |
D.草木灰(主要成分是K2CO3) |
A.0.O6% | B.0.48% | C.0.35% | D.0.6% |
A.一定是纯净物 |
B.一定含碳酸钠 |
C.可能是碳酸钠、碳酸钙、碳酸镁的混合物 |
D.无法确定 |
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