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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