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如图,圆锥的底面半径为5,母线长为20,一只蜘蛛从底面圆周上一点A出发沿圆锥的侧...
如图,圆锥的底面半径为5,母线长为20,一只蜘蛛从底面圆周上一点A出发沿圆锥的侧面爬行一周后回到点A的最短路程是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753008_ST/images0.png)
A.8
B.10
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753008_ST/0.png)
C.15
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753008_ST/1.png)
D.20
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753008_ST/2.png)
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A.
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B.
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C.
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D.
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下列事件中,必然事件是( )
A.若a是实数,则|a|≥0
B.某运动员跳高的最好成绩是20.1米
C.掷一枚硬币,正面朝上
D.从刚生产的产品中任意抽取一个,是合格品
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如图,直线AB、CD交于点O,OT⊥AB于O,CE∥AB交CD于点C,若∠ECO=30°,则∠DOT等于( )
A.30°
B.45°
C.60°
D.120°
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已知x、y满足方程组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753004_ST/0.png)
,则x-y的值为( )
A.9
B.6
C.5
D.3
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如图,在△ABC中,D是BC延长线上一点,∠B=40°,∠ACD=120°,则∠A等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101191232476275376/SYS201311011912324762753003_ST/images0.png)
A.60°
B.70°
C.80°
D.90°
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