【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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无法判断
【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
【单选题】
四格表中,当a=30,b=60,c=40,d=50时,最小理论频数等于( )
【单选题】
边距属性为“上边距:20px、下边距:30px、左边距:40px、右边距:50px”正确的设置是( )。
①
margin:20px 30px 40px 50px
②
border: 20px 30px 40px 50px
③
margin:20px 50px 30px 40px
④
margin-top:20px 30px 40px 50px
【单选题】
右心声学造影显影次序,右房-右室-左室-主动脉,考虑为:
【单选题】
右心声学造影显影次序:右房-右室-左室-主动脉,考虑为( )
【单选题】
右心声学造影显影次序:右房-右室-左室-主动脉,考虑为()
【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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铅垂线
【单选题】
设一个关系模式为R(A,B,C),对应的关系内容为R={{1,10,50},{2,10,60},{3,20,72}{4,30,60}},则δB>15(R)的运算结果中具有的元组个数为( )。