已知三角形的两边长分别为3cm和8cm，则该三角形的第三边的长可能是(    )

音乐会上，演员正在演奏二胡，二胡发声是因为琴弦在____ ，演奏过程中，演员不断调整手指在琴弦上的按压位置是为了改变声音的____ 。

根据短文内容，判断正（T）误(F)。

    Hi! I'm Mike. Welcome to my room(房间). Look! Here are my toys. This is my boat. It's on the desk. I have a ball. It’s in the toy box. I like my car. It's under the chair. Where is my cap? It isn't in my room. Ah! It's on my head. Ha-ha!