A.[(b-c)/125a]×100% | B.[(b-2c)/125a]×100% |
C.[(b-c)/250a]×100% | D.[(8b-8c)/a]×100% |
A.①②③ | B.③④⑤ | C.①④⑤ | D.②③⑤ |
A.邓稼先 | B.李四光 | C.华罗庚 | D.侯德榜 |
A.1∶3 | B.1∶2 | C.2∶3 | D.3∶2 |
A.苏打、小苏打 | B.胆矾、绿矾 |
C.三硝酸甘油酯、硝化甘油 | D.纯碱、烧碱 |
A.偏铝酸钠溶液 | B.苯酚钠溶液 |
C.硅酸钠溶液 | D.硫代硫酸钠溶液 |
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