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当前学科：中学历史综合练习
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下面是某历史教师在讲授《民族政权并立的时代》一课时的教学片段：教师A：“同学们，宋真宗的时候，辽军向北宋猖狂进攻……”。教师B：“当北宋和辽签订了澶渊之盟，刚刚安抚好辽以后，西夏又窜了出来……”。教师C：“我们北宋与辽议和”“我们北宋每年给辽岁币”。问题：
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确定车辆最佳载重量选择的首要因素是()。
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不锈钢也称耐酸钢。
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航空器在塔台管制区飞行时危险接近的标准为（）。
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