正规性科学活动、非正规性科学活动和偶发性科学活动的共同之处在于（）

与正规性科学活动相比，非正规性科学活动中（）。

学前儿童正规性科学活动（）。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

在幼儿园的科学教育中，科学活动的主要类型除正规性与非正规性科学活动外，还有（）。

与正规性科学活动相比，以下说法中能够说明是非正规性科学活动产生的作用是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。