以下可以作曲木弯曲成形的理论依据的是（）。
A.纤维素两相结构理论
B.纤维素结晶结构理论
C.木素热塑化理论
D.纤维素的吸湿性
参考答案：C
证券市场的纵向结构关系是由一级市场和二级市场构成的。 ( )
People have the belief ______ factories should produce fewer things from raw materials, ______the supply is growing smaller and smaller.
A．which; that
B．that; of which
C．that; whose
D．which; whose
