田径运动会上使用的发令枪,当打响后即可发出一团白烟,由此可见

田径运动会上使用的发令枪,当打响后即可发出一团白烟,由此可见枪中子弹可能有的成分是

AP          B.C          C.S          D. Fe

答案

A

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