混凝土浇筑应（）浇筑，各部位应对称浇筑振捣密实，且振捣器不得触及防水层。

用附着式振捣器振捣的混凝土分层浇筑厚度是（）。

关于水泥混凝土路面施工中混凝土的摊铺与振捣的说法正确的有（ ）。

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。

混凝土浇筑采用机械振捣，其振捣的方法有( )。

补充混凝土浇筑与振捣措施。