文档介绍：of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of t
－2
－3
0
1
－1
－2
－3

（A）（B）
0
1
－1
－2
－3
0
1
－1
－2
－3

（C）（D）
6．当时，的结果是
（A）．（B）．
（C）．（D）．
7．将一个n边形变成n+1边形，内角和将
（A）减少180°．（B）增加90°．
（C）增加180°．（D）增加360°．
8．某校为了丰富学生的校园生活，准备购买一批陶笛，已知A型陶笛比B型陶笛的单价低20元，用2700元购买A型陶笛与用4500元购买B型陶笛的数量相同，设A型陶笛的单价为元，依题意，下面所列方程正确的是
（A）．（B）．
（C）．（D）．
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities3
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
9．如图，在⊙O中，AC∥OB，∠BAO=25°，
C
B
A
O
（第9题图）
则∠BOC的度数为
（A）25°．
（B）50°．
（C）60°．
（D）80°．
10．从1，2，3，4中任取两个不同的数，其乘积大
于4的概率是
（A）．
（B）．
左视图
主视图
（第11题图）
2cm
俯视图
（C）．
（D）．
11．一个几何体的三视图如图所示，这个几何体的侧
面积为
（A）cm2．
（B）cm2．
（C）cm2．
（D）cm2．
12．请你计算：
，
，
…，
猜想…的结果是[来源:学科网]
（A）．（B）．
（C）．（D）．
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities15