3-氰基吡啶熔点在50℃，为使其保持液态，储存温度定于多少摄氏度比较合适，52-55合适吗 大学里哪些理工科专业不涉及化学和物理?
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2H3PO4+ 3CaSO4+2H2O=Ca3(PO4)2(\u2193)+3H2SO4+2H2O
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熔化。将一块铝加热到660度，开始熔化，此时温度不再上升，
一直到全部熔化，温度才继续上升。
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