How should crontab be written to run at a specific point in time?

the time is as follows:
every day 08 30,10 code 10, 10:40 < / time > how to write it out with one command?

can you write multiple arbitrary time points, for example:
2018-12-03 14 purge 09, 2019-03-22 15:17


you have no rules these days. You can't use one, only one at a time

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*****command 

0 8 * * * curl http://xxxx.com
30 8 * * * curl http://xxxx.com
10 10 * * * curl http://xxxx.com
40 10 * * * curl http://xxxx.com

A command cannot do


your
08 code 00, 08:30 is 00,30 8 * *?
10 code 10, and 10:40 is 0 10 code 40 10 * *?

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in special cases, some can be written together, but it is best to write separately. is clear

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35064-2bf42.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35064-2bf42.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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