题目内容

目前人造关节所用原材料不外乎于金属和塑料两大类,由于人体内钾、钠、氯等化学物质有可能使金属材料腐蚀生锈,塑料老化,所以选用的金属和塑料的化学物质必须高度稳定。 这段话主要支持这样一种观点,即( )。

A. 人造关节必须用金属制造
B. 塑料人造关节容易老化
C. 人体内钾、钠、氯等化学物质很活跃,有腐蚀作用
D. 制造人造关节必须选用化学性质高度稳定的金属和塑料

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