通过人类听觉，可以从外部世界获取__________左右的信息。 A: 5% B: 6% C: 11% D: 12% E: 83% F: 100%

计算∫20(x2+1)dx=（　　） A: 143 B: 5 C: 113 D: 83

Use the following information for ECE incorporated: Assets $200 million Shareholder Equity $100 million Sales $300 million Net Income $15 million Interest Expense $2 million If ECE reported $15 million in net income, then ECE's Return on Equity (ROE) is: A: 5.0% B: 7.5% C: 10.0% D: 15.0%

常用的检索系统有() A: ECE B: CLL C: SCI D: EI

Photoshop常用的文件格式有() A: psd B: jpg C: png D: gⅰf

设函数y=f(x)有二阶导数，对任意实数x，满足：f(x)=-f(-x)及f(x)=f(x+1)，若f'(1)＞0，则有 ( ) A: f"(-5)≤f'(-5)≤f(-5) B: f(-5)=f"(-5)＜f'(-5) C: f'(-5)≤f(-5)≤f"(-5) D: f(-5)＜f(-5)=f"(-5)

______________属于图像格式文件。 A: BMP B: WMA C: PNG D: JPG E: AVI F: GIF

Use the following information for ECE incorporated: Assets $200 million Shareholder Equity $100 million Sales $300 million Net Income $15 million Interest Expense $2 million If ECE reported $15 millio A: 5.0% B: 7.5% C: 10.0% D: 15.0%

常见图片格式有()等。 A: .bmp B: .jpg C: .gif D: .png E: .tif F: .exe

常用图像文件格式有（ ） A: BMP B: JPEG C: PNG D: GIF E: PSD F: TIFF