Debian 9 Stretch
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[1] It's possible to make sure services' status like follows.
# display the list of services which are running

systemctl -t service

UNIT                             LOAD   ACTIVE SUB     DESCRIPTION
console-setup.service            loaded active exited  Set console font and keym
cron.service                     loaded active running Regular background progra
dbus.service                     loaded active running D-Bus System Message Bus
getty@tty1.service               loaded active running Getty on tty1
getty@ttyS0.service              loaded active running Getty on ttyS0
ifup@ens3.service                loaded active exited  ifup for ens3
keyboard-setup.service           loaded active exited  Set the console keyboard
systemd-update-utmp.service      loaded active exited  Update UTMP about System
systemd-user-sessions.service    loaded active exited  Permit User Sessions
user@0.service                   loaded active running User Manager for UID 0

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

28 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# the list of all services' setting

systemctl list-unit-files -t service

UNIT FILE                              STATE
apt-daily-upgrade.service              static
apt-daily.service                      static
autovt@.service                        enabled
bootlogd.service                       masked
bootlogs.service                       masked
bootmisc.service                       masked
urandom.service                        static
user@.service                          static
x11-common.service                     masked

121 unit files listed.
[2] Stop and turn OFF auto-start setting for a service if you don'd need it. (it's atd as an example below)
systemctl stop atd

systemctl disable atd

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