According to the passage, words are ______.
A.visual letters
B.represented by sounds
C.represented either by sounds or letters
D.signs called letters
第3题
A.缝合皮肤常用三角针、丝线作间断缝合
B.缝合腹膜时用圆针、丝线可吸收缝合线
C.缝合神经和血管时常用无损伤针线
D.缝合方法有间断、连续、“∞”字、荷包等缝合
E.缝合程序包括进针、出针、结扎三个基本步骤
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