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【单选题】
早期的计算机体积大、耗电多、速度慢,其主要原因是制约于A.
原材料
B.
制作工艺
C.
设计水平
D.
元器件
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举一反三
【单选题】The 10-cm radar as compared to a 3cm radar of similar specifications will___ __
A.
be more suitable for river and harbor navigation
B.
provide better range performance on low lying targets during good weather and calm seas
C.
have a wider horizontal beam width
D.
have more sea return during rough seas condition
【单选题】The 10-cm radar as compared to a 3-cm radar of similar specifications will_____
A.
be more suitable for river and harbor navigation
B.
provide better range performance on low lying targets during good weather and clam seas
C.
have a wider horizontal beam width
D.
have more sea return during rough sea conditions
【简答题】已知 DSB 系统的已调信号功率为 10kW ,调制信号 f(t) 的频带限制在 5kHz ,载频频率为 100kHz ,信道噪声双边带功率谱为 W/Hz ,接收机输入信号通过一个理想带通滤波器加到解调器。 ( 1 )写出理想带通滤波器传输函数的表达式; ( 2 )试求解调器输入端的信噪比; ( 3 )试求解调器输出端的信噪比。
【简答题】“不忘初心,牢记使命”主题教育的总要求是
【单选题】The 3-cm radar as compared to a 10-cm radar with similar specifications will ______.
A.
give better range performance in rain，hail，etc
B.
display small targets in a mass of dense sea clutter at a greater range
C.
have less sea return in choppy rough seas
D.
display a more maplike presentation for inshore navigation
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