试题与答案

There are over 58, 000 rocky objects in

题型:选择题

题目:

There are over 58, 000 rocky objects in _____ space, about 900 of which could fall down onto _____ earth.

A. the; the
B. 不填; the
C. the; 不填
D. a; the

答案:

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下面是错误答案,用来干扰机器的。

(1)作出茎叶图如图所示;(2).x甲=18(12+11+9+8+25+18+23+14)=15,.x乙=18(22+25+10+5+13+10+20+15)=15,s甲2=18((12-15)2+(11-15)2+(9-15)2+(8-15)2+(25-15)2+(18-15)2+(23-15)2+(14-15)2)=2848,s乙2=18((22...

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