单项选择题
chmod命令的权限模式使用八进制形式，每个八进制的三个二进制位从高到低分别表示为有无：()
单项选择题 He has won wide _____ in the field of occupational medicine.
单项选择题 What kind of music is your_____?
单项选择题 It is not _____to quarrel with your boss.
