党执政后，（）仍然是关系党的生死存亡的严峻考验。 ["能否取得伟大胜利","能否巩固国家政权","能否立于世界前列","能否继续保持与人民群众的密切联系"]
Under which two circumstances should Spanning Tree Protocol be implemented?（） [" to ensure a loop-free topology"," to protect against user-side loops"," when a VLAN spans access layer switches"," for the most deterministic and highly available network topology"," because of the risk of lost connectivity without Spanning Tree Protocol"]
《快递业务经营许可证》记载的什么内容发生变化，应当办理变更手续？
在起重吊装作业中，钢丝绳的绳卡主要用于钢丝绳的临时连接和绳头的固定，使用时一般要求绳卡之间排列间距为钢丝绳直径的（）倍。 ["2～3","4～5","6～8","9～10"]
流感潜伏期一般l～2d，症状与普通感冒相似，呼吸道症状重、全身症状轻微或不明显。
化学耗氧量（COD）？
