【单选题】【消耗次数:1】
下列物质的熔点由高到低的顺序为a. CuCl2   b. SiO2   c. NH3   d. PH3
A.a>b>c>d
 B.b>a>c>d
C.b>a>d>c
D.a>b>d>c
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