（）, 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。

依观赏习性，园林树木学可分为（）。

下列哪种植物不适合做儿童游乐园绿篱（）

单位的绿篱修剪要保持常年平齐，新芽高于平齐线（）要及时全面修剪。

绿篱栽植一般用沟植法，沟深应比苗木根部长度深（）厘米为宜。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。