一个立方面心金属晶体的晶胞中含有几种质点，其原子分数坐标为何？

<p><font face="宋体" size="3"> </font><span lang="EN-US">4</span><span>个质点，</span><span> </span><span>原子分数坐标为：（<span lang="EN-US">0</span>，<span lang="EN-US">0</span>，<span lang="EN-US">0</span>），（<span lang="EN-US">1/2</span>，<span lang="EN-US">0</span>，<span lang="EN-US">0</span>），（<span lang="EN-US">0</span>，<span lang="EN-US">1/2</span>，<span lang="EN-US">0</span>），（<span lang="EN-US">0</span>，<span lang="EN-US">0</span>，<span lang="EN-US">1/2</span>）</span></p>