轴测图一般不能反映出物体各表面的实形，因而度量性差同时作图较复杂。
参考答案：对
( )是农产品成本调查的最主要内容。
A．农产品成本调查核算指标体系 B．农产品调查核算指标体系C．产品成本调查核算指标体系 D．农产品指标体系
In recent years, the economy of our country____________ rapidly. [ ]
A. is increased
B. has increased
C. increased
D. has been increased
