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【单选题】把一根十分长的绳子拉成水平,用手握其一端.维持拉力恒定,使绳端在垂直于绳子的方向上作简谐振动,则
A.
振动频率越高，波长越长
B.
振动频率越低，波长越长
C.
振动频率越高，波速越大
D.
振动频率越低，波速越大
【单选题】It is reassuring to know that there is always someone around to help, just like what we were told in our childhood---life is beautiful.
A.
comforting
B.
confident
C.
comfortable
D.
confirmative
【单选题】把一根十分长的绳子拉成水平，用手握其一端．维持拉力恒定，使绳端在垂直于绳子的方向上作简谐振动，则
A.
振动频率越低，波长越长
B.
振动频率越高，波长越长
C.
振动频率越高，波速越大
D.
振动频率越低，波速越大
【简答题】RLC 串联回路谐振时,阻抗 ,总电流 ,回路品质因数 Q 越高,通频带 ,选择性 。
【单选题】it is reassuring to know that there is always someone around to help, just like what we were told in our childhood--life is beautiful
A.
comforting
B.
comfortable
C.
confident
D.
confirmative
【单选题】把一根十分长的绳子拉成水平，用手握其一端．维持拉力恒定，使绳端在垂直于绳子的方向上作简谐振动，则
A.
振动频率越低，波长越长．
B.
振动频率越高，波速越大．
C.
振动频率越高，波长越长．
D.
振动频率越低，波速越大
【单选题】把一根十分长的绳子拉成水平,用手握其一端,维持拉力恒定,使绳端在垂直于绳子的方向上作简谐振动,则
A.
振动频率越高，波长越长
B.
振动频率越低，波长越长
C.
振动频率越高，波速越高
D.
振动频率越低，波速越高
【单选题】It is reassuring to know that there is always someone around to help, just like what we were told in our childhood--life is beautiful.
A.
comforting
B.
comfortable
C.
confident
D.
confirmative
【单选题】It is reassuring to know that there is always someone around to help, just like what we were told in our childhood- life is beautiful.
A.
comfortable
B.
comforting
C.
confident
D.
painstaking
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