variable的作用是()。A、指定环境变量名B、指定要指派给变量的一系列字符串C、显示出所有系统环境变量D、错误命令

题目

variable的作用是()。

  • A、指定环境变量名
  • B、指定要指派给变量的一系列字符串
  • C、显示出所有系统环境变量
  • D、错误命令

相似考题
参考答案和解析
正确答案:A
更多“variable的作用是()。”相关问题
  • 第1题:

    ______ is the address of a variable or a variable in which the address of another variable is stored.

    A.Director

    B.Pointersystem

    C.Array

    D.Record


    正确答案:B
    解析:译文的含义是:()是一个变量的地址或存储了其他变量地址的变量。A、B、C、D各选项的意思分别是:控制器、指针、数组、记录。很明显,题目描述的是指针,所以应该选择B。

  • 第2题:

    ______is the address of.a variable or a variable in which the address of another variable is stored.

    A.Director

    B.Pointer

    C.Array

    D.Record


    正确答案:B
    解析:指针是一个变量的地址或者是存储了另一个变量地址的变量。

  • 第3题:

    Which statements concerning the value of a member variable are true, when no explicit assignments have been made?()  

    • A、The value of an int is undetermined.
    • B、The value of all numeric types is zero.
    • C、The compiler may issue an error if the variable is used before it is initialized.
    • D、The value of a String variable is "" (empty string).
    • E、The value of all object variables is null.

    正确答案:B,E

  • 第4题:

    在Java语言中,下面变量命名合法的有()

    • A、variable123
    • B、123varable
    • C、Private(private)
    • D、-variable_123

    正确答案:A

  • 第5题:

    CVT(Continuously Variable Transmission)


    正确答案:是机械式无级变速传动系统—金属带式无级传动系统的简称,由金属带、主、从动工作轮、液压泵、起步离合器和控制系统等组成。其核心元件金属带由多个金属片和两组金属环组成。

  • 第6题:

    闸阀的主要作用是作()用,不允许作()用。


    正确答案:切断、节流

  • 第7题:

    temp=’this is a temped variable’;echo foo${temp}上述命令执行的结果为()

    • A、foo
    • B、foo$temp
    • C、foo’this is a temped variable’
    • D、foothis is a temped variable

    正确答案:D

  • 第8题:

    The system administrator is making system wide changes to a server, which will add to the PATH variable for the server environment. Where is the PATH variable found for the system?()

    • A、/profile
    • B、/etc/envpath
    • C、/etc/profile
    • D、/etc/environment

    正确答案:D

  • 第9题:

    跑道边灯应为固定灯具,显示可变的白光。()

    • A、Runway edge lights shall be fixed lights showing variable white.
    • B、Runway middle lights shall be fixed lights showing variable white.
    • C、Runway edge lights shall be fixed lights showing vary white.
    • D、Taxiway edge lights shall be fixed lights showing variable white.

    正确答案:A

  • 第10题:

    单选题
    A variable displacement system of hydraulic drives consists of ().
    A

    a variable displacement axial piston pump

    B

    a constant displacement axial piston pump

    C

    a reciprocating piston pump

    D

    a centrifugal pump


    正确答案: B
    解析: 暂无解析

  • 第11题:

    单选题
    () is made of a boss with separated blades mounted into it.
    A

    A variable pitch propeller

    B

    A variable pitch nut

    C

    A fixed pitch parallel

    D

    A fixed pitch screw


    正确答案: A
    解析: 暂无解析

  • 第12题:

    单选题
    What does it mean for a variable in the Application Editor to be defined as a parameter?()
    A

    The variable can be used to pass data to and from subflows.  

    B

    The value for that variable can be supplied via Application Configuration in Application Administration.  

    C

    The value for that variable is defined by the calling application.  

    D

    The variable can be used in conditional steps.  

    E

    The variable can be used to pass data to and from VoiceXML applications.


    正确答案: C
    解析: 暂无解析

  • 第13题:

    VLSM的含义是()。

    A.Variable Length Subnet Masking

    B.Variable Length Shortest Masking

    C.Very Long/Shortest Masking

    D.Variable Long Subnet Masking


    正确答案:A

  • 第14题:

    闸阀的主要作用是作切断用,不允许作节流用。


    正确答案:正确

  • 第15题:

    VLSM的含义是()。

    • A、Variable Length Subnet Masking
    • B、Variable Length Shortest Masking
    • C、Very Long/Shortest Masking
    • D、Variable Long Subnet Masking

    正确答案:A

  • 第16题:

    基肥的主要作用是(),因此,常用()肥料作基肥。


    正确答案:供应作物苗期所需的养分;有机肥

  • 第17题:

    VLSM的含义是()

    • A、Variable Length Subnet Masking
    • B、Variable Length Shortest Masking
    • C、Very Long/Shortest Masking
    • D、Variable Long Subnet Masking
    • E、Variable Length Short Measurement

    正确答案:A

  • 第18题:

    What does it mean for a variable in the Application Editor to be defined as a parameter?()

    • A、The variable can be used to pass data to and from subflows.  
    • B、The value for that variable can be supplied via Application Configuration in Application Administration.  
    • C、The value for that variable is defined by the calling application.  
    • D、The variable can be used in conditional steps.  
    • E、The variable can be used to pass data to and from VoiceXML applications.

    正确答案:B

  • 第19题:

    he system administrator is making system wide changes to a server, which will add to the PATH variable for the server environment.  Where is the PATH variable found for the system?()

    • A、/profile
    • B、/etc/envpath
    • C、/etc/profile
    • D、/etc/environment

    正确答案:D

  • 第20题:

    Which substitution variable would you use if you want to reuse the variable without prompting the user each time?()

    • A、&
    • B、ACCEPT
    • C、PROMPT
    • D、&&

    正确答案:D

  • 第21题:

    单选题
    An administrator needs to add the /usr/vac/bin directory to their PATH environment variable for the current session.  Which of the following will accomplish this task()
    A

    path=$path:/usr/vac/bin; export path

    B

    path.=/usr/vac/bin; export $path

    C

    Modify the path environment variable in /etc/profile

    D

    Modify the path environment variable in /.profile


    正确答案: A
    解析: 暂无解析

  • 第22题:

    单选题
    The auto-complete feature in the JUNOS CLI is triggered by which method?()
    A

    space bar for both command and variable completion

    B

    space bar for command completion;tab key for variable completion

    C

    space bar for variable completion;tab key for command completion

    D

    tab key for variable and command completion;space bar for command completion


    正确答案: D
    解析: 暂无解析

  • 第23题:

    单选题
    Which substitution variable would you use if you want to reuse the variable without prompting the user each time?()
    A

    &

    B

    ACCEPT

    C

    PROMPT

    D

    &&


    正确答案: C
    解析: 暂无解析