题目:
下列关于金属晶体的叙述中正确的是 [ ]
A.常温下,金属单质都以金属晶体形式存在
B.金属阳离子与自由电子之间的强烈作用,在一定外力作用下不因形变而消失
C.钙的熔沸点低于钾
D.温度越高,金属的导电性越好
答案:
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