为什么支架在检修前应采取可靠的稳固措施？

A. is flowing towards the land
B. is moving towards the ocean
C. level is not changing
D. level is rising because of heavy rai

A. 音频处理辅芯片
B. CODEC
C. MIDI电路
D. 运放输出芯片

A. 正确
B. 错误

A. 正确
B. 错误