人耳朵最敏感的声音频率范围是
A.500~1000Hz
B.1000~2000Hz
C.1000~4000Hz
D.2000~4000Hz
E.3000~5000Hz
参考答案:C
—What else do you want?
—_________ else. I think I have got everything now. [ ]
A. Something
B. Everything
C. Nothing
D. Anything
液体金属冲压的实质、基本特点及应用范围是什么?