与常规GRE脉冲序列相比，稳态GRE脉冲序列的最主要特征是（）

GRE序列中血流常呈现（　　）。

GRE序列中血流常呈现（）

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。

序列设计中，根据正常空间的序列，高潮的出现常放在（）位置.
 

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

关于GRE序列用于心脏检查的描述，正确的是（）