You have multiple methods to select part of an audio file.
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The right and left arrow keys can be used to adjust your selection more precisely.
A. 对
B. 错
The Sel time display fields have nothing to do with your selection.
A. 对
B. 错
The commands of delete silence, convert a selection to silence and add silence to an audio file are in the Edit, Transform and Generate menu respectively.
A. 对
B. 错
Amplitude, Delay Effects, Noise Reduction and Special are all commands in the Transform menu.
A. 对
B. 错