【单选题】【消耗次数：1】
冠脉钙化积分是多少岁以上有意义
①
20
②
30
③
40
④
50
⑤
60
参考答案：
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某医院一年内收治202例腰椎间盘后突病人，其年龄的频数分布如下，为了形象表达该资料，适合选用（ ）年龄(岁)：10～20～30～40～50～60～ 人数: 6 40 50 85 20 1
①
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【单选题】
已知A、B、C三点坐标分别为（10、20、30）（20、40、60）、（30、60、90），则A、B、C三点______。
①
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②
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④
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