linux - 为什么在sudoers中配置了NOPASSWD却还需输入密码?

这是我的sudoers的配置文件

Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

# Host alias specification
Host_Alias TX=12x.xxx.xxx.xx9

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL
www_remote TX=(root) NOPASSWD:/bin/chown

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# See sudoers(5) for more information on "#include" directives:

#includedir /etc/sudoers.d

在远程登录到www_remote后执行sudo chown仍需输入密码

[root@VM_xx_xx_centos ~]# sudo -u apache ssh xxx.xxx -l www_remote
Linux iZ...Z 3.2.0-4-amd64 #1 SMP Debian 3.2.86-1 x86_64

Welcome to aliyun Elastic Compute Service!

Last login: Sun May 14 17:55:32 2017 from 12x.xxx.xxx.xx9
www_remote@iZ...Z:~$ ls -l
总用量 0
-rw-r--r-- 1 www-data www_remote 0  5月 14 16:38 test
www_remote@iZ...Z:~$ sudo chown :www-data test 
[sudo] password for www_remote: 
www_remote 无权在 iZ281fkjotsZ 上运行 sudo。此事将被报告。

如果是www_remote ALL=(root) NOPASSWD:/bin/chown 的话就可以正常执行指令.

我的配置到底错在哪了?