在现有的农业技术和栽培条件下，通过作物蒸腾和被植物利用的水分大约占总浇灌量多少？

氮有什么用途？

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。

作物生产技术的特点中季节性，每年有24个农业节气，其中有立春、立秋、立夏、立秋，这个“立”是（）的意思.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

有些作物不用施氮肥，也不会缺氮，它们根部生长着许多微生物，具有：（）。