用于制造隐形飞机的某种物质具有吸收微波的功能，其主要成分的结构简式如图，它属于
A．烃
B．无机物
C．有机化合物
D．烷烃
答案：C
After the new technique was introduced，the factory produced ____ in 2001 as the year before．
A．as twice many machines
B．twice many as machines
C．as many machines twice
D．twice as many machines
金融远期合约的种类有哪些？
