answer for UEC 07

same...tis mayb mur mistake

nt going to write all
juz sum question

3)D
*every number which isnt 质数，is 合数

11）B

15)B
* dunnoe ask here

18)B

20)C

21)D

23)A
*把pai抽出来
RxR-rxr=33
R是大圆的半径
r是小圆的半径

29）B
log2 x=0.66
log2 y=1.68
tat means
2的0.66次方=x
2的1.68次方=y

37)E
平方式来的