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 （）.

The（）may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

Banks have no liability for any delay or loss caused by postal or telex failure.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

分析发动机活塞环的工作条件，油环的工作条件尤为恶劣。

发动机的活塞从油环槽下端面至活塞底面的部分称（），起到为活塞运动导向和承受侧压力的作用。

组合式油环的刮油性能优于普通油环。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。