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.

下列选项中，不属于我国一类保护植物的是（　　）。

树脂多为植物体内哪一类成分经过复杂的化学变化而形成（）

树脂多为植物体内哪一类成分经过复杂的化学变化而形成

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

植物的10个花粉母细胞可以形成：多少花粉粒？多少精核？多少管核？又10个卵母细胞可以形成：多少胚囊？多少卵细胞？多少极核？多少助细胞？多少反足细胞？

秋季观果或秋色叶植物具有很强的季节感，可形成丰富的季相变化。下列植物中季节感不明显的是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。