（）, 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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

生物膜具有物质运输的功能，以下物质是通过协助扩散进入细胞的是（）。

选出下列不能通过简单扩散进入生物膜的物质（）。

下列哪些物质跨膜运输方式属于主动运输：（）。

在下列细胞物质运输方式中，不需能量而属于被动运输的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。