化学杂交剂（Chemical Hybridizing Agent，CHA）

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.

African Americans stopped using chemical straighteners or hot irons because ______.

Chemical Tankers are generally referred to the cargo ships constructed or adapted and used for the carriage of（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

利用杂种优势必需的条件是（）。

什么杂种优势？杂种优势利用主要包括哪些主要环节？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。