下列各项中,不符合典型心绞痛疼痛特点的是()
A. 情绪激动时已发生
B. 疼痛位于胸骨后
C. 疼痛性质呈刀割样
D. 疼痛可放射至左肩
E. 疼痛常伴有窒息感
腹痛多为活动后绞痛的是
A. 肠梗阻
B. 急性阑尾炎
C. 腹膜炎
D. 肾输尿管结石
E. 急性胃肠炎
In the function model of access network defined in ITU-T G.982, there are five successive building blocks in the user data plane, which are______________, ______________, ______________, ______________, ________________.
TreetopologyisusedinPONsystem,whichiscomprisedof______________,______________,______________.