（）, 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 （）.

MZD《在延安文艺座谈会上的讲话》发表于（）。

1942年毛泽东在延安文艺工作者座谈会上发表重要讲话，指出革命文艺的根本方向是为（）服务。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

毛泽东在《在延安文艺座谈会上的讲话》中提出文艺服务对象应该包括（）。

简述毛泽东《在延安文艺座谈会上的讲话》的中心思想和历史意义。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。