人耳对1kHZ声波感觉的声强从10-12W/m2到1<br/>W/m2,若用分贝表示,其范围是( ) A: 12~2<br/>dB B: 1~120<br/>dB C: 0~12<br/>dB D: 0~120<br/>dB E: 1~12<br/>d( B )

/ananas/latex/p/1802

下列设置打开文件对话框OpenFileDialog1的Filter属性正确的是_________。 A: OpenFileDialog1.Filter=Pictures(*.Bmp)|*.Bmp B: OpenFileDialog1.Filter=["Pictures(*.Bmp)"|"*.Bmp"] C: OpenFileDialog1.Filter="Pictures(*.Bmp)|*.Bmp" D: OpenFileDialog1.Filter={Pictures(*.Bmp)|*.Bmp} E: OpenFileDialog1.Filter=(Pictures(*.Bmp)|*.Bmp)

世界上第一部《医学伦理学》于（ ）年出版。 A: 1801 B: 1802 C: 1803 D: 1804 E: 1805

下列设置打开文件对话框OpenFileDialog1的Filter属性正确的是_________。 A: OpenFileDialog1.Filter=Pictures(*.Bmp)|*.Bmp B: OpenFileDialog1.Filter=[&quot;Pictures(*.Bmp)&quot;|&quot;*.Bmp&quot;] C: OpenFileDialog1.Filter=&quot;Pictures(*.Bmp)|*.Bmp&quot; D: OpenFileDialog1.Filter={Pictures(*.Bmp)|*.Bmp} E: OpenFileDialog1.Filter=(Pictures(*.Bmp)|*.Bmp)

The sound of a band is rated as 50 dB at a distance of 30.0 m. What is the dB sound level of the band when one is 10.0 m from the band? A: 59.5 dB B: 57.3 dB C: 55.2 dB D: 52.9 dB E: 50.1 dB

1海里等于（）米。 A: 1802 B: 1822 C: 1852 D: 1872

信号功率 = 1 mw = ______ dBm = ______ dBμ

下列伪指令有错吗？如果有请指出错误原因。 X1 DB 35H,0,-80 ; X2 DB 35,260,-1 ; X3 DB 1234H ;

1贝尔(Bel)等于( )分贝(dB)。 A: 100 B: 1 C: 10 D: 1000