You started a long transaction. Before committing， you executed a query on one of the tables currently being modified. You received the following error： ORA-01555： snapshot too old How would you prevent such an error in the future？（） ["guarantee undo retention","add one more redo log group","size the redo log files appropriately","size the UNDO tablespace appropriately","size the SYSTEM tablespace appropriately","configure an appropriate undo retention interval","change automatic undo management to manual"]
液化石油气的闪点比汽油低，故其火灾危险程度比汽油（）。 ["高","一样","低"]
重大事故，是指造成（） ["造成30人以上死亡，或者100人以上重伤","造成10人以上30人以下死亡，或者50人以上100人以下重伤","造成3人以上10人以下死亡，或者10人以上50人以下重伤，或者1000万以上5000万以下直接经济损失的事故","造成3人以下死亡，或者10人以下重伤，或者1000万以下直接经济损失的事故"]
The users request that [F2], [F3], and [F4] be used to commit, rollback, and exit,respectively. How do you accomplish this?（） ["Add the appropriate PL\/SQL code for each key. ","Map the logical keys to the physical keys, then add the appropriate PL\/SQL code for each key.","Create an object library to define the key triggers, then reference the object library in the form. ","This cannot be accomplished because other function keys provide this functionality by default."]
某患者，男性，32岁，肩背部红、肿、热、痛5d，人院后护理评估发现，T38、9℃p93/min、R22/min；肩背部可见一直径10cm的发红区，高出皮肤，其中心发紫，周边发红，其内可见多个脓头，挤压疼痛，且有灰白色脓液流出。该患者可能是（） ["疖","疖病","痈","蜂窝织炎","丹毒"]
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