There are many factors that influence the sampling error, such as, extent of mark variation, amount of sampleunit and the choice of sampling method, etc.
影响抽样误差大小有很多因素，如标志变异程度，样本单位数量的多少，抽样方式方法的选择等。
2
The runclient.sh script can also be used to run the sample against a remote grid by providing the hostname and port to the processing unit grid's catalog service as a single parameter.
sh 脚本也可用于针对一个远程网格运行样例，方法是将主机名和端口作为单个参数提供给处理单元的目录服务。
3
The test practice sections at the end of each unit together constitute a whole sample IELTS test.