什么是网络经济？它有哪些特征？

Look at the pride on Tom's face. He _____ to have been praised by the manager just now. [ ]

A. seemed

B. seems

C. had seemed

D. is seeming

金属全冠初戴就位困难的主要原因哪项不对

A．接触点过紧

B．组织面有小结节

C．基牙上有倒凹

D．基牙表面过于粗糙

E．铸件变形

以下选项中，符合所给图形的变化规律的是（）。

A．A

B．B

C．C

D．D

因为应收账款可能发生坏账，将来收取的货币是不确定的，因此，应收账款属于非货币性资产。( )