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【单选题】
砌筑砂浆的组成材料包括胶凝材料、细骨料、()和水。A.
粗骨料
B.
石灰
C.
掺加料
D.
石膏
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【单选题】特性阻抗为Z 0 的无耗传输线终端接负载Z L ，若Z L 为容性负载，则传输线上距离负载最近处为______点。
A.
电压波腹
B.
电压波节
C.
电流波节
D.
各种可能的波节波腹
【简答题】如图所示无耗传输线，证明：当Z g =Z 0 时，不管负载多大，传输线有多长，恒有|U i1 |=|U i2 |=|E|/2成立，并且负载吸收功率P L =P i (1-|Г L | 2 )， 为入射波功率。
【简答题】Old people are always saying that the young are not what they were. The young are better educated. They have a lot more money to spend and enjoy more . They grow up more quickly and are not so ...
【简答题】Scala关于变量定义、赋值,错误的是? A、val a = 3 B、val a:String = 3 C、var b:Int = 3 ; b = 6 D、var b = "Hello World!" ; b = "123" 2、关于和Scala进行交互的基本方式REPL说法错误的是? A、R 读取(read) B、E 求值(evaluate) C、P 解析(Parse) D、L 循环(Loop)...
【简答题】Old people are always saying that the young people are not【61】they were. The same comment is【62】from generation to generation and it is always【63】. It has never been truer than it is today. The young ...
【简答题】若长为l的无耗均匀传输线的特性阻抗为Z 0 ，负载为Z L ：求
【简答题】Old people are always saying that the young people are not 【C1】______ they were. The same comment is 【C2】______ from generation to generation and it is always 【C3】______ . It has never been truer than...
【简答题】下图为一均匀无耗传输线电路，已知Z 0 =100Ω，负载Z L1 =50Ω，Z 12 =30+j10Ω，工作波长λ=3m，源E g =20V，Z g =Z 0 =100Ω求
【简答题】Passage Two Old people are always saying that the young are not what they were. The same comment is made from generation to generation and it is always true. It has never been truer than it is today. ...
【简答题】一均匀无耗传输线的Z 0 =500Ω，负载Z L =(300+j400)Ω，λ=3m，传输线长度为l=1.25λ，源E g =50V，Z g =Z 0 =500Ω，求：
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