单项选择题
A.rm -rf ./test_chk_lnB.rm -rf ./test_chk_ln/C.rm -r ./test_chk_ln/D.delete ./test_chk_ln/
A./etc/host.confB./etc/hostnameC./etc/hostsD./etc/resolv.conf
A.MapReduce，Hive，HBaseB.MapReduce，MySql，Google AppsC.MapReduce，Redis，IguanaD.MapReduce，Heron，Trumpet