The echo command expects one or more strings, so this line produces an error complaining about the missing closing quote on ( what Vim assumes to be) the second string. echo命令要求一个或多个字符串,因此此行代码将生成一个错误,指出第二个字符串缺少一个右引号(Vim是这样认为的)。
If the character is a closing parenthesis, pop all operators until you reach an opening parenthesis and append them to the result string. 如果字符是个闭括号(closingparenthesis),在遇见开括号前,弹出所有操作符,然后把它们添加到结果字符串。
If you want the beginning or closing quotation marks to be included in the string, you must double them. 如果要在字符串中包括左引号或右引号,则必须用两个引号。
Conventional TCP tech is only limited to the combination of that with MFE tool which accomplishes opening or closing the down valve by hoisting up or setting down testing string and not suits for operation of special well to cause low successful ratio and safe reliability. 传统的油管传输射孔技术仅限于单管柱传输射孔与MFE测试工具联作,通过上提下放管柱来实现井下测试阀的开关,不适合特殊井的施工,施工成功率低,安全可靠性差。