在顺反子中，把两个突变点分别位于两条染色体上称为反式式，若有互补，表明两个突变点位于不同顺反子中；若没有互补，表明它们位于同一顺反子中。检验两个突变点是否属于一个基因即顺反子的实验叫互补实验，是由（）首先提出的。

下面哪些因素可防止DNA上的一个点突变表现在蛋白质的一级结构?( )

PCR-ASO可用于点突变的检测。

PCR扩增阻碍突变系统检测可用于哪些类型的分子检测（）

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。

（）检测技术可用于混凝土结合面的质量检测和混凝土内部空洞、疏松等缺陷的检测。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。