下载centos镜像详细查看该博客https://blog.csdn.net/whd1985whd/article/details/84709583官网下载Index of /centos-vault/http://mirrors.neusoft.edu.cn/centos/选择对应的版本号，此处选择的是7.9,选择对应的isos文件夹，x86_64，CentOS-7-x86_64-DVD-200

linux CPU大小[root@idc ~]# cat /proc/cpuinfo |grep “model name” && cat /proc/cpuinfo |grep “physical id” model name: Intel(R) Xeon(TM) CPU 2.80GHz model name: Intel(R) Xeon(TM) CPU 2.80G

 官方地址：https://developer.android.com/ndk/downloads/index.html#downloadDNK下载2、解压，将Android NDK压缩包解压到你想要的目录下,如/opt/android/ndk/ndk$ chmod a+x android-ndk-r10e-linux-x86_64.binndk$ ./android-ndk-r10c-linux