单项选择题

国家对医疗器械实行分类管理，人工心脏瓣膜在管理分类上属于（）

A.第一类
B.第二类
C.第三类
D.第四类
E.第五类

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热门试题

单项选择题

大熊猫改吃竹子的原因是什么?

A.进化过程的需要
B．生理活动的改变
C．生存环境的变化
D．素食思想的影响

单项选择题

Why more and more people became interested in becoming computer programmers?（）

A．Because the job is very interesting.
B．Because they can get well paid in this profession.
C．Because it takes no great efforts to learn to do it.
D．Because of the high social status of the professionals.