【单选题】双踪示波器显示某通道的正弦信号波形如下图所示,这时该通道的电压档位旋钮( VOLTS/DIV)旋钮位于“0.5V”位置,扫描速率旋钮(TIME/DIV)旋钮位于“0.5ms”位置。该正弦信号的峰峰值与频率分别为( )。
【单选题】COS5020G示波器显示某通道的正弦信号波形如下图所示,这时该通道的VOLTS/DIV旋钮位于“0.5V”位置,TIME/DIV旋钮位于“0.5ms”位置。该正弦信号的幅值与频率分别为()。
【简答题】什么是混凝土的弹性模量和变形模量?二者有何区别和关系?怎样测定弹性模量?
【单选题】示波器显示某通道的正弦信号波形如下图所示,这时该通道的 VOLTS/DIV旋钮位于“0.5V”位置,TIME/DIV旋钮位于“0.5ms”位置。该正弦信号的最大值与频率分别为( )。
【简答题】Read the passage about job title inflation and choose the best sentence(A-G) to fill the gap(1-6). A That's a lot of chiefs and not very many Indians B Have you got greater responsibilities? C They ma...
【单选题】由空间距离、消费投向等因素形成的旅游资源的区域差异性称为( ) The regional difference of tourism resources formed by such factors as space distance, consumption and investment is called ( )
A.
经济差 the difference of economic conditions
B.
自然差 the difference of natural conditions
C.
趋势差 the difference of development trends
D.
位势差 the difference of location conditions