Consumer porcelains in Jingdezhen are not selling well in export market as compared with those made in Liling, Hunan Province and Zibo, Shandong Province.

A．on export market

B．in exporting market

C．in exported market

D．in the export market

对下列二叉树进行前序遍历的结果是

A．ZBTYCPXA

B．ATBZXCYP

C．ZBTACYXP

D．ATBZXCPY