Loudness can be objectively perceived by human ear. (
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举一反三
- The vibration frequency perceived by the human ear is A: 20 ~ 10000Hz B: 20 ~ 20000Hz C: 20 ~ 30000Hz D: 20 ~ 2000Hz
- 8.The growth track of the human brain can be perceived through the analysis of fossils.
- Hearing is the ability to detect _______ and performed by ____. The human ear can only be sensitive in the range of frequency of ___ Hz. to ___ Hz.
- Your right ear is the ___of your left ear. A: opposited side B: counterpart C: duplication
- He must have heard of the bad news, ________ can be perceived in his expression. [br][/br]A) as [br][/br]B) what [br][/br]C) while [br][/br]D) that