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生物可降解与吸收高分子材料

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钛及钛合金人工牙根的表面处理方法一般可分为____、_、_和____四大类。

Which of the following is NOT mentioned as one of the ways children can deal with money？_____
A: Donating their money to the poor.
B: Buying a desirable new cell phone.
C: Setting costly goals for themselves.
D: Saving it in a personal bank account.

简述膨体聚四氟乙烯在口腔颌面外科的应用。

西安市河长制工作于今年2月份正式启动，构建了三级河长体系。()

A. 对
B. 错