图中力F在平面OABC内,该力对x、y、z 轴的矩是( )。[img=178x155]17afa9e7aa05f34.png[/img] 未知类型:{'options': ['[tex=15.0x1.357]jFuVUdq53INowNO3BX5TPHnMQshYIfHnWQ3+ZYH+q0EhtvWS2TC8EuyKJrlUckSjvyCh0Mxd3pdoDC1NsP9FmQ==[/tex]', '[tex=16.929x1.286]/ENgHpFaf5PRcX5hfTBt42BJX2A1E5ZwDL0yyNrftoNsuBCObFJ708hp5tB2dKrXtx6Ug0CjGx+T/Jx4eBcmvQ==[/tex]', '[tex=16.929x1.286]Ukr/C4mCwvnjTVG6UjScagVJa2ZuimiKrenx9msBs6xeI9CTnDHPt3WZjxHPquXDsBzJNKMidt/zpSpY/StNgQ==[/tex]', '[tex=16.929x1.286]Ukr/C4mCwvnjTVG6UjScagVJa2ZuimiKrenx9msBs6xeI9CTnDHPt3WZjxHPquXDCHawHVTHK9LDKbFyQVlYY39IX7vFqqmIvD8lQHMrUMk=[/tex]'], 'type': 102}
图中力F在平面OABC内,该力对x、y、z 轴的矩是( )。[img=178x155]17afa9e7aa05f34.png[/img] 未知类型:{'options': ['[tex=15.0x1.357]jFuVUdq53INowNO3BX5TPHnMQshYIfHnWQ3+ZYH+q0EhtvWS2TC8EuyKJrlUckSjvyCh0Mxd3pdoDC1NsP9FmQ==[/tex]', '[tex=16.929x1.286]/ENgHpFaf5PRcX5hfTBt42BJX2A1E5ZwDL0yyNrftoNsuBCObFJ708hp5tB2dKrXtx6Ug0CjGx+T/Jx4eBcmvQ==[/tex]', '[tex=16.929x1.286]Ukr/C4mCwvnjTVG6UjScagVJa2ZuimiKrenx9msBs6xeI9CTnDHPt3WZjxHPquXDsBzJNKMidt/zpSpY/StNgQ==[/tex]', '[tex=16.929x1.286]Ukr/C4mCwvnjTVG6UjScagVJa2ZuimiKrenx9msBs6xeI9CTnDHPt3WZjxHPquXDCHawHVTHK9LDKbFyQVlYY39IX7vFqqmIvD8lQHMrUMk=[/tex]'], 'type': 102}
下列国家和地区代码所代表的国家地区中文简称正确的是()。 A: BRA(巴西)、AUT(奥地利)、ARG(阿根廷) B: CAN(加拿大)、HKG(香港)、DNK(丹麦) C: EGY(埃及)、FIN(芬兰)、PRK(朝鲜) D: UKR(乌克兰)、ARE(阿联酋)、POL(波兰)
下列国家和地区代码所代表的国家地区中文简称正确的是()。 A: BRA(巴西)、AUT(奥地利)、ARG(阿根廷) B: CAN(加拿大)、HKG(香港)、DNK(丹麦) C: EGY(埃及)、FIN(芬兰)、PRK(朝鲜) D: UKR(乌克兰)、ARE(阿联酋)、POL(波兰)
衍射屏由两个错开的网络构成,其透过率可以表示为:[tex=30.357x1.357]6sHpHW95thvnbpPifFTwRBxZ131C+hugJcrP2C2q2q0X52/1uKR/JSXe5Xki3v/lvMazoukolGveLL1tAQlPpCm+NK8XwBoabaX9u4u2jGPjUJ7sSqx9kqh3LRaFgjiNfD0kzJ7BHfGC69pKssI6BHxGIeFE9ipUhXIQjIJL4kejVEoHIjSZPX2uw09fND3m7jOs9Z20T2ktukY2S+F1SoOZn8omxlF7nYvV4yTxpcnvytmCPj1XD01Lghsw4Wy72AUCH5UV36DW7OoDhjtr+HyRRud07HX0qx70N/tIDI551vTVoTEsyvJmH7rgWzm3[/tex]采用单位振幅的单色平面波垂直照明,求相距为[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex]的观察平面上夫琅禾费衍射图样的强度分布。画出沿[tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex]方向的截面图。
衍射屏由两个错开的网络构成,其透过率可以表示为:[tex=30.357x1.357]6sHpHW95thvnbpPifFTwRBxZ131C+hugJcrP2C2q2q0X52/1uKR/JSXe5Xki3v/lvMazoukolGveLL1tAQlPpCm+NK8XwBoabaX9u4u2jGPjUJ7sSqx9kqh3LRaFgjiNfD0kzJ7BHfGC69pKssI6BHxGIeFE9ipUhXIQjIJL4kejVEoHIjSZPX2uw09fND3m7jOs9Z20T2ktukY2S+F1SoOZn8omxlF7nYvV4yTxpcnvytmCPj1XD01Lghsw4Wy72AUCH5UV36DW7OoDhjtr+HyRRud07HX0qx70N/tIDI551vTVoTEsyvJmH7rgWzm3[/tex]采用单位振幅的单色平面波垂直照明,求相距为[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex]的观察平面上夫琅禾费衍射图样的强度分布。画出沿[tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex]方向的截面图。
for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是:__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常
for i in range(b.max_row): for j in range(b.max_column): print(b.cell(row=i,column=j).value)上面语句运行的结果是:__________。 A: 1 1 1 1 1 1 1 1 1 1 B: 1111111111 C: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D: 出现异常
【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1
【单选题】CDMA通信的基站,假定基站A的码片序列是+1 +1 +1 -1 -1 +1 -1 -1,基站发射bit为101时,实际发射的信号是 A. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 B. +1 +1 +1 -1 -1 +1 -1 -1 –1 –1 –1 +1 +1 –1 +1 +1 +1 +1 +1 -1 -1 +1 -1 -1 C. +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 +1 +1 +1 -1 -1 +1 -1 -1 D. –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1 –1 –1 –1 +1 +1 –1 +1 +1
for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是()。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1
for i in range(1,11): for j in range(1,11): b.cell(row=i,column=j).value=1 #b是一个工作表对象for i in range(1,11): for j in range(1,11): print(b.cell(row=i,column=j).value,end=" ") print()上面程序代码运行的结果是()。 A: 1 B: 1 1 1 1 1 1 1 1 1 1 C: 1111111111 D: 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1
下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )
下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )
请仔细观察下面行列式的计算过程,如果四个等号都理解了,请选择A,否则请选择B。 | a 1 1 1 1 | |a+4 a+4 a+4 a+4 a+4| | 1 a 1 1 1 | | 1 a 1 1 1 | | 1 1 a 1 1 |= | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 a | | 1 1 1 1 1 | | 1 a 1 1 1 | =(a+4) | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 1 | | 0 a–1 0 0 0 | =(a+4) | 0 0 a–1 0 0 | | 0 0 0 a–1 0 | | 0 0 0 0 a–1 | =(a+4)(a–1)^4
请仔细观察下面行列式的计算过程,如果四个等号都理解了,请选择A,否则请选择B。 | a 1 1 1 1 | |a+4 a+4 a+4 a+4 a+4| | 1 a 1 1 1 | | 1 a 1 1 1 | | 1 1 a 1 1 |= | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 a | | 1 1 1 1 1 | | 1 a 1 1 1 | =(a+4) | 1 1 a 1 1 | | 1 1 1 a 1 | | 1 1 1 1 a | | 1 1 1 1 1 | | 0 a–1 0 0 0 | =(a+4) | 0 0 a–1 0 0 | | 0 0 0 a–1 0 | | 0 0 0 0 a–1 | =(a+4)(a–1)^4
共有4个站进行码分多址通信。4个站的码片序列为:a:(-1 -1 -1 +1 +1 -1 +1 +1) b:(-1 -1 +1 -1 +1 +1 +1 -1) c:(-1 +1 -1 +1 +1 +1 -1 -1) d:(-1 +1 -1 -1 -1 -1 +1 -1) 现收到这样的码片序列:(-1 +1 -3 +1 -1 -3 +1 +1),则( )发送1。
共有4个站进行码分多址通信。4个站的码片序列为:a:(-1 -1 -1 +1 +1 -1 +1 +1) b:(-1 -1 +1 -1 +1 +1 +1 -1) c:(-1 +1 -1 +1 +1 +1 -1 -1) d:(-1 +1 -1 -1 -1 -1 +1 -1) 现收到这样的码片序列:(-1 +1 -3 +1 -1 -3 +1 +1),则( )发送1。
共有四个站进行CDMA通信,现收到这样的码片序列(-3 +1 -1 -1 +1 +1 +1 -3),则下列站点发送了数据1的是( ) A: (-1 -1 -1 +1 +1 -1 +1 +1) B: (-1 -1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1)
共有四个站进行CDMA通信,现收到这样的码片序列(-3 +1 -1 -1 +1 +1 +1 -3),则下列站点发送了数据1的是( ) A: (-1 -1 -1 +1 +1 -1 +1 +1) B: (-1 -1 +1 -1 +1 +1 +1 -1) C: (-1 +1 -1 +1 +1 +1 -1 -1) D: (-1 +1 -1 -1 -1 -1 +1 -1)