消失模铸造中，提高型砂的紧实度、降低浇注温度和真空度、增加涂料的厚度和均匀性等都有利于防止（）缺陷。

（）是指普调考、技能竞赛、新员工结业考试或技能竞赛等规模较大的考试考核活动。

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.

新中源水龙头行业铸造工艺是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

加油站经理认证考核（试）包括理论知识考试和实操技能考核。其中理论知识考试（）分以上为合格，实操技能考核（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

硅砂分级代号中，表示二氧化硅含量最高的代号是（）。