Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, 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。

桥梁部件分为主要部件和次要部件。梁式桥的主要部件有哪些？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

某公路上有一计算跨径l0＝55m的梁式桥，计算其在公路—Ⅱ级汽车荷载作用下主梁产生的剪力效应时，其均布荷载标准值最接近下列哪一项？（　　）

某公路上有一计算跨径l0＝20m的梁式桥，计算其在公路—Ⅱ级汽车荷载作用下主梁产生的弯矩效应时，其集中荷载标准值最接近下列哪一项？（　　）