SDSD
- abbr.start dial signal delay 开始拨号信号时延
SDSD-
If the wave condition is same , with the increasing of sediment size , the scour and deposition patterns can be classified into DSD type , SDSD type and DSDS type .
在相同波浪条件下，随着泥沙相对粒径的由细变粗，堤前冲淤形态可分为DSD型、SDSD型和DSDS型。
-
But average R-R intervals , maximal R-R intervals , minimal R-R intervals , SDSD twice consecutively and position of main frequency at high frequency were higher significantly than those of students from common department ( P < 0.05 );
而平均R-R间期值、最大的R-R间期值、最小的R-R间期值、连续两次R-R间期之差的标准差、高频段频峰的位置均显著高于普通系学生（P<0.05）；