-Did you hear that John lost his job?
-It_______ that he had made some serious mistakes in his work.
C
暂无解析
半固定桥适用于：
辅助固位形式是指
以下哪种情况需要进行掩蔽测听
OSPL90的条件是：
下列关于耳间衰减的说法中不正确的是
