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。

信用证的结算方式是凭单付款，银行付款的前提是受益人提交的单据（）。

按CIF贸易条件成交的合同，一些国际规则已经订明：卖方凭单交货，买方凭单付款，实行单证和货款对流的原则。

寄单索偿下的凭单付款有以下哪几种情况？（）

寄单索偿下的凭单付款有以下几种情况（）。

凭单索偿方式是（）以决定收汇快慢。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。