何谓混凝土的徐变?考虑混凝土的徐变在结构工程中有何实际意义?

水泥混凝土的徐变是指砼在固定荷载作用下的瞬时变形。

混凝土的徐变是指混凝土在一定荷载长期作用下，随着时间而产生增加的塑性变形。

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（）.

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。

掺活性混合材料的水泥抗碳化能力差的原因是由于水泥石中的（）