使用()形式时，即使表达式中有Shell的特殊字符时，也不必用双引号将其括起来。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

Shell是Linux操作系统的核心。（）

Shell是Linux操作系统的核心。（）

shell不仅是（），它同时也是一种功能强大的编程语言。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

下列对shell变量FRUIT操作，正确的是：（　　）。

在Shell脚本中，用来读取文件内各个域的内容并将其赋值给Shell变量的命令是（　　）。