下列不属于瓷全冠的优点的是 （）
A.色泽稳定自然
B.不需要金属，不透金属色
C.不导热、不导电
D.强度高，脆性小
E.生物相容性好
参考答案：D
爸爸：妈妈( )。
A．叔叔：阿姨
B．哥哥：姐姐
C．兄弟：姐妹
D．爷爷：奶奶
Some of the low-end Made-in-China mechanical-electronic products are not selling well in export market as compared with what are termed as high-end ones.
A．on export market
B．in exporting market
C．in exported market
D．in the export market
