男性调阈的宽窄在()之间。
A: 100~200Hz;
B: 100~300Hz;
C: 150~200Hz;
D: 150~300Hz;
E: 200~300Hz。
A: 100~200Hz;
B: 100~300Hz;
C: 150~200Hz;
D: 150~300Hz;
E: 200~300Hz。
举一反三
- 男性调阈的宽窄在()之间。 A: A100~200Hz; B: B100~300Hz; C: C150~200Hz; D: D150~300Hz; E: E200~300Hz。
- An open pipe of air supports standing waves at frequencies of 300 Hz and 400 Hz. There are no other frequencies between these two. What is the frequency of the second harmonic of this tube? A: 100 Hz B: 200 Hz C: 400 Hz D: 600 Hz
- 人耳最敏感的振动频率为 A: 20~20000Hz B: 1,000~3,000Hz C: 100~300Hz D: 3,000~9,000Hz E: 9,000~12,000Hz
- 人耳最敏感的振动频率为( ) A: 20~100Hz B: 100~300Hz C: 1,000~3,000Hz D: 3,000~9,000Hz E: 9,000~12,000Hz
- 工频的频率是( ) A: 50Hz B: 60 Hz C: 100 Hz D: 200 Hz