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问题
单项选择题
韦伯提出的概念和工具不包括（）.
A.区位因子
B.类型空间变化法则
C.原料指数
D.等运费线
答案
参考答案：B
填空题
若tan
A
2
•tan
B
2
+tan
B
2
•tan
C
2
+tan
A
2
•tan
C
2
=1
，则cos（A+B+C）=______．
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选择题
Recently my father bought a Chinese painting, ____ was very reasonable.
A. the price of whose
B. which price
C. the price of which
D. it price
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