Unlike a passive solar home, an active solar home uses mechanical equipment, such as pumps and blowers, and an outside source df energy to help heat the house when solar energy is not enough.
与消极供暖房屋不同的是，积极供暖房屋使用机械设备，比如泵、风箱，以及外部的能量源，以保证太阳能不足时也可以给房屋供暖。
The DF 21d's uniqueness is in its ability to hit a powerfully defended moving target with pinpoint precision — a capability U.S. naval planners are scrambling to deal with.
东风21d导弹拥有无以伦比对强大的防御移动目标的精密打击的能力-美国海军计划者一直争夺对付的能力。
Districts reporting DF/DHF cases are Baucau, Dili, Ermera, Liquica, Maliana, Manatuto and Viqueque, with 76% of the cases reported from Dili ( see previous report).
报告登革热/登革出血热病例的县为包考、帝力、埃尔梅拉、利基萨、马利亚纳、马纳图托和维奎奎，其中帝力报告的病例占76%（见以前的报告）。
You can determine the free space and usage for entire file systems using df, but this only gives you part of the picture.
使用df，您可以确定整个文件系统的空闲空间和空间使用情况，但这只是描述了部分信息。
Others, such as du, df, ls, and most of the standard userland come from FreeBSD, but have been slightly modified by Apple.
还有一些，比如du,df,ls，以及大部分的标准的用户态，来自于FreeBSD，但是被苹果公司略微的修改过。
Or, the following USES df to show the space on a user's home directory.
或者，下面使用df显示了一个用户的home目录的空间信息。
This article gives you the tools you need to be successful, including the use of df, du, find, and even the use of quotas.
本文向您介绍一些完成管理工作所需的工具，包括df、du、find的使用，甚至配额的使用。
The value given is the size of the file in the default block size for that system, just as that used with df.
得到的值是文件的大小，单位为该系统中的缺省块大小，与df所使用的单位相同。
Other versions of the df tool (notably Solaris) report the bare block and file availability information by default.
其他版本的df工具(特别是Solaris)，缺省情况下将报告空块和文件可用性信息。
The script USES df, extracts only the line you want with grep, and then USES awk to extract the fourth column of data, which is the amount of free space.
该脚本使用df仅提取了要进行grep的行，然后使用awk提取数据的第4列，该列是空闲空间的大小。
The df tool is actually short for disk free, and that is precisely what the tool shows.
df工具实际上是diskfree 的缩写，并且这也正是该工具所显示的内容。
This is why the shape of the Chi Square sampling distribution changes for different df values.
这就是为什么X平方分布的抽样分布的形状随着df值的不同而变化的原因。
Using differentials means that we will try to express df in terms of dz in this particular situation.
利用微分法我们可以，表示出这种情况下的df和dz的关系。
Using the df command, you can look at all mounted file systems or specific file systems.
使用df命令，您可以查看所有已挂载的文件系统或者特定的文件系统。
The first example, written in PHP, will capture the output of the shell command "df -h," place the output into an array, and then examine each line of output against a regular expression.
采用PHP编写的第一个示例将捕获Shell命令“df—h”的输出，将输出放在一个数组中，然后根据一个正则表达式检查输出的每一行。
Depending on your UNIX environment, the default output from df might contain a range of different information.
根据您的UNIX环境的不同，df的缺省输出可能包含各种不同的信息。
As you study these Chi Square graphs, note that the shape of the probability functions change when you vary the degrees of freedom, or df, in your experiment.
当您研究这些X平方分布图时，请注意，当您在实验中改变自由度(即df)时，概率函数的形状会改变。
The df command: Learn more about the df command from the Combined IBM Systems Information Center.
df命令：从CombinedIBMSystems信息中心了解有关df命令的更多信息。
You can further display the output information using the standard df command without any flags (see Listing 14).
您可以使用不带任何标志的标准df命令，进一步显示相关的信息(请参见清单14)。
This output is very different from the previous — flagged — version, because it is just the unfiltered results of df -h with a print statement injected at the top.
此输出与前面带标记的版本区别非常大，因为它只是使用顶部注入的print语句来打印的未经筛选的df—h命令结果。
As shown in Listing 6, the df command shows you the total number of blocks used on each available volume and the percentage of free space.
如清单6所示，df命令为您显示每个可用卷上已使用的块的总数，以及空闲空间的百分比。
And then we plugged into the formula of df z to express df over dz, or partial f, partial z with y held constant.
然后代入df的表达式中，表示出df与dz的关系,也就是y不变时的df/dz，或者是∂f/∂
Another way to check the amount of free space in an external snapshot is to mount the image and use the df command.
检查外部快照中的空闲空间量的另一种方式是，挂载映像并使用df命令。
Use df, with the -i command-line option, to get the inode statistics or, on traditional UNIX systems, the bare df output shows the number of 'files' created.
可以使用带- i命令行选项的df命令获取索引节点的统计信息，或者在传统的UNIX系统中，不带参数的df可以输出创建“文件”的数目。
If you are moving an existing file system to a larger partition, (rather than a single directory within an existing file system) then use the output from df to determine the current file system size.
如果您将现有的文件系统(而不是现有的文件系统中的单个目录)移动到一个更大的分区，那么可以使用df的输出来确定当前文件系统的大小。
Df -h also shows how the disk was partitioned.
df - h还会显示磁盘的分区情况。
And now I have a relation between df and dt.
现在得到了df和dt的关系。
On 2 April 2008, the State of Rio de Janeiro reported 57 010 cases of dengue fever (DF) including 67 confirmed deaths and 58 deaths currently under investigation.
2008年4月2日，里约热内卢州报告登革热病例57 010例，包括67例登革热确诊死亡，另有58例死亡正在调查之中。
The Web page shown in Listing 5 declares the df prefix for the JSP library containing the tag file.
清单5 中显示的Web页面为包含标记文件的JSP库声明df前缀。
The Web page shown in Listing 5 declares the df prefix for the JSP library containing the tag file.
清单5 中显示的Web页面为包含标记文件的JSP库声明df前缀。
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