某医院的外科住院患者由于换药时使用未经消毒的敷料而导致的外科切口感染，这种感染属于（）

系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。

中国历史上最著名的外科医师是

Shutdown price（or point，or rule） 停业价格（或停业点、停业原则）

翻译：With Average or With Particular Average（WA or WPA）（）

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述乙醚吸入麻醉方法及注意事项。

乙醚是谁先发现的（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。