在多轨混录模式下可供插入的轨道有（）。
A.音频轨
B.MIDI轨
C.视频轨
D.总线轨
参考答案：A, B, C, D
Mom wanted to know _______ last weekend. [ ]
A. what Amy does
B. what does Amy do
C. what Amy did
D. what did Amy do
单腿直立试验是用来测试
A．腰部有无侧凸畸形
B．两下肢有无长短不均
C．髋关节的臀中肌、臀小肌的功能及股骨头与髋臼的关系是否正常
D．臀大肌是否瘫痪
