题目：
理想晶体的特点是原子排列绝对整齐，没有一点儿缺陷。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：本题考查北京的水系河流。北京天然河道自西向东贯穿五大水系：拒马河水系、永定河水系、北运河水系、潮白河水系、蓟运河水系。故本题答案为D选项。
理想晶体的特点是原子排列绝对整齐，没有一点儿缺陷。
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