要显示sendmail服务在2345启动级别中的状态，用指令：
#--list sendmail
显示结果如下：
sendmail 0:off 1:off 2:off 3:off 4:off 5:off 6:off
#--list sendmail
显示结果如下：
sendmail 0:off 1:off 2:off 3:off 4:off 5:off 6:off
举一反三
- 启动时点火开关拨动顺序为( )档→( )档→( )档;重新打启动档时,点火开关必须从( )开始。 A: OFF;ON;ST;OFF; B: OFF;OFF;ON;ST; C: ST; OFF;ON; OFF; D: ON;OFF; ST;OFF;
- 用axis off命令可以不显示网格线，用grid off命令可以不显示坐标轴。
- How much off was the dress the author found? A: 15% off B: 30% off C: 50% off D: 25% off
- Two men took the parcel off the plane. They ______ . A: took off it B: it took off C: took off D: took it off
- The sports meeting ____. A: put off B: is put off C: is to put off D: is putted off