“十二五”规划提出，我国在“十二五”期间全国耕地保有量将保持在（）亿亩。

我国耕地资源中存在的问题主要是耕地（）减少和耕地（）降低。

有关我国环境人口容量的正确叙述是（）。 ①我国人口与淡水、耕地等资源之间的矛盾已十分突出 ②城市化的发展和人口的增长使可耕地的总数和人均耕地有继续减少的趋势 ③我国最大环境人口容量在16亿左右 ④目前我国人口与环境处在良性循环阶段

我国144亿亩土地资源中，现有耕地面积为（）亿亩。

我国的耕地有多少亿亩（）

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.

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。