胸外心脏挤压时，（）用力垂直向下挤压。

胸外心脏挤压是挤压是挤压凹膛下方部位，压陷深度为（）厘米。

男：你会游泳吗？女：不会，但我很想学。男：那明天我们一起去游泳吧，我可以教你。女：好吧。问：谁会游泳？

到一个不熟悉的游泳场馆游泳时，首先应了解（）。

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.

游泳运动对人体的作用，谈谈你对游泳运动的认识与体会。

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。