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【单选题】
On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)A.
The destination host sends a request to the source for retransmission.
B.
The jam signal indicates that the collision has been cleared.
C.
The hosts will attempt to resume transmission after a time delay has expired.
D.
An electrical pulse indicates that the collision has cleared.
E.
The router on the segment will signal that the collision has cleared.
F.
The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
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【单选题】正常产褥期子宫复旧哪项是正确的（）
A.
正常子宫复旧宫底每天应下降2～3横指
B.
子宫颈管在产后5日始能复原，内口形成
C.
子宫体变化在产后10日左右降入骨盆腔
D.
子宫内膜变化在产后10日已经复旧
E.
所谓产褥期为产后3个月内
【单选题】正常产褥期子宫复旧哪项是正确的?
A.
正常子宫复旧宫底每天应下降2～3横指
B.
子宫体变化须产后10天左右降入骨盆腔
C.
子宫颈管在产后5天始能复原，内口形成
D.
子宫内膜变化在产后10天已经复旧
E.
所谓产褥期为产后3个月
【单选题】正常产褥期子宫复旧哪项是正确的
A.
正常子宫复旧宫底每天应下降2~3横指
B.
子宫颈管在产后5天始能复原,内口形成
C.
子宫体变化须产后10天左右降入骨盆腔
D.
子宫内膜变化在产后10天已经复旧
E.
所谓产褥期为产后3个月内
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