对于周期信号,经整周期采样后,可完全避免栅栏效应。
参考答案:对
Mr Anderson left for Colombia two months ago.That’s a pity. I wish___.
A.I’d meet him
B.I’ll have met him
C.I’d have met him
D.I’ll meet him
下列疾病可出现直腿抬高试验阳性的是
A.腰椎间盘突出症
B.梨状肌综合征
C.慢性腰肌劳损
D.髂胫束紧张
E.退生性脊柱炎