划分地壳，地幔和地核的两个一级不连续面是（）和（）。

工程地质学是研究人类工程与地质环境相互作用的一门学科，是地质学的一个分支。（）

组成地壳的基本物质是岩石（　）。地幔与地壳的分界面为莫霍面，地幔占地球总质量的66％，根据地震波传播速度的特征，它可分为（）和（）两部分。

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。

地壳与地幔以（）为分界。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。