Which three Layer 2 access designs have all of their uplinks in an active state？（） ["Flex Links","loop-free U","looped square","looped triangle","loop-free inverted U"]
简述普通手术术后护理伦理要求？
党委对党支部上报的预备党员转正的决议，应在（）内讨论审批 ["三个月","六个月","一年","一年半"]
童年经验
一面白旗高举：表示（）。 ["危险、易发生问题，立即停止工作","正常，可以继续工作","线已拉到指定位置，接头工作己结束","工作已结束，全部停止工作，收工"]
简述包卷层理和滑塌构造的基本特征。
