题目

如图所示,在两个固体薄片上涂上一层很薄的石蜡,然后用烧热的钢针尖接触薄片,接触点周围的石蜡被熔化,如图.则图                                                                               所示薄片一定是晶体.                                                                                                                                                                                                                                    答案:甲
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