正弦规应用（）原理测量零件的锥度和斜度的。
A.余弦
B.勾股弦
C.正弦
D.正切
参考答案：C
This information allows businessmen to keep________ of their list of goods by showing which items
are being sold and how fast they are moving.[ ]
A. sight
B. track
C. touch
D. sign
国家授权经营国有土地使用者一般不得向( )以外的单位和个人转让土地。
A．个体业主 B．民营企业 C．外资国有企业 D．集团公司
