【单选题】
老年人( ),要合理分配全天食物量,一般早餐占25%~30%,中餐占40%,晚餐占 30%~35%。
【单选题】
用某种排序方法对线性表(25,87,21,47,15,27,63,35,20)进行排序时,元素序列的变化情况如下:(1)25,87,21,47,15,27,63,35,20(2)20,15,21,25,47,27,63,35,87(3)15,20,21,25,35,27,47,63,87(4)15,20,21,25,27,35,47,63,87则采用的排序方法是___________排序长度为4。
【单选题】
已知点A(20,20,10),点B(20,25,30),则( )产生重影点。
【单选题】
已知四点A(10、20、30)、B(30、20、10)、C(10、20、10)、D(20、20、30),则对H面的重影点为______。
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A与D,D点可见
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B与C,B点可见
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A与C,A点可见
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A与C,C点可见
【单选题】
一组数据19,16,22,25,35,20,32,24的中位数是( ).
【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______。
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不能表示一个平面
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表示一个特殊位置平面
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无法判断
【单选题】
A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
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正垂线
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侧垂线
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正平线
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铅垂线
【判断题】
典型大陆地壳厚度约35-40km,但山脉下地壳厚度变薄,仅厚度约18-20km( )。(1.0分)
【单选题】
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