Yes, you can. And the machine will let you through. In fact, buying full ticket and only taking partial intervals is a widely used method in China, especially when the tickets are hard to get, like in the Spring Festival. The system is smart enough to cope with such situations.
Yes, you may do so.
From the official China Railway customer service website (in Chinese):
Q: Can a passenger board a train at an intermediate stop after they have purchased a ticket?
A: Yes, they may do so provided they board the specified train at the specified date. However, the fare for the unused interval will not be refunded.
Credit:stackoverflow.com‘
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