预防急性上呼吸道感染最重要的措施（　）

急性上呼吸道感染的治疗原则是（）

急性上呼吸道感染的治疗原则是（）

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.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

急性上呼吸道感染主要的病原体为病毒，普通感冒最常见的病因是

急性上呼吸道感染主要的病原体为病毒，以下病毒是普通感冒最常见病因的是

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。