问题描述：
[单选]
根据医疗安全（不良）事件严重程度分几级？（）
A．2级
B．3级
C．4级
D．5级
参考答案：查看无
答案解析：无
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答案解析：无
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上一篇：医疗安全（不良）事件报告的目的是( )（）
下一篇：DSuper typhoon Rammasun swept over Hainan， China， destroying at least 23，000 houses and causing 2 billion dollars in damage． It was not just people who experienced the impact， though． In Hainan Bawangling National Nature Reserve， home to the world"s 30 remaining Hainan gibbons（长臂猿）， landslides tore through sections of the forest． The gibbons， a species living in trees， were forced to jump across a distance of up to 50 feet to get from one area to another．The gibbons sometimes would break their fall only by managing to catch hold of the tip of a particular palm leaf． As months passed， Bosco Chan at the Kadoorie Farm and Botanic Garden in Hong Kong noticed that constant use caused the leaf to wear and bend downward， threatening to lead to the gibbons crashing down and breaking the extremely rare species" habitat into different islands． "It"s really a matter of concern． Moreover， I didn"t know how long the leaf would be able to hold the gibbons，" he said． "I thought it was time for us to build something．"As recently described in Scientific Reports， Bosco Chan and his colleagues turned to aerial（空中的） bridges． They hired professional tree climbers to confront and get over the steep landform to fix a simple bridge， consisting of two parallel mountaineering-grade ropes． It took the gibbons over five months to catch on， but once they learned to use the ropes， they started regularly using them to make safe， quick crossings．Till now， aerial bridges have been used in other countries to help a diversity of animals ranging from squirrels to capuchin monkeys． But many are small， one-off projects carried out by local organizations or even individuals; with little or no scientific study of what does or does not work． In addition， a solution for one species or habitat may not be applicable to another．12．What can be learned about Hainan gibbons？（）
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