熔模铸造所生产的铸件没有分型面。

不同材料、不同铸造方法生产铸件所能得到的最小壁厚不一样，用砂型铸造灰铸铁件时，能获得的最小壁厚为（）。

与砂型铸造相比金属型成型有哪些特点？这些成型特点对铸件的质量产生哪些影响？

砂型铸造、金属型铸造、熔模铸造、压力铸造相比，大批生产时压力铸造的生产率最高。

特种铸造因铸件质量好，生产效率高，必将取代砂型铸造。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。