12×16 |
12×16+1×18+19+14×3+16×3 |
A.可能有毒 |
B.含有碳、氢、氯三种元素 |
C.氯元素的质量分数为26.6% |
D.分子中碳、氢、氯的原子个数比为2:3:3 |
A.30% | B.40% | C.60% | D.70% |
A.NH4HCO3 | B.NH4C1 | C.NH4NO3 | D.CO(NH2)2 |
A.碳酸氢铵是氮肥 |
B.保存碳酸氢铵要注意防雨,防晒 |
C.这种化肥种碳酸氢铵质量分数是94.8% |
D.碳酸氢铵含三种元素 |
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