合同法律关系的内容是指( )。
A．合同条款
B．权利和义务
C．违约责任
D．索赔条款
参考答案：B
_________ a lot of troublesome affairs to deal with,our boss doesn't have any time to spend holidays.
A．Thanks to
B．For
C．With
D．In case
解释rwxr-xr--和chmod 755 abc的权限情况。
