How about China Changxing Automobile Company? They only sign a one-year contract. What if they don't renew the fee after one year?

Not bad. Are you an undergraduate? Changxing is a subordinate unit of the Fourth Hospital and a state-owned enterprise. Generally speaking, there is nothing you are worried about. As long as you behave well after you come, you won't be left behind. Should be very stable, as long as you are willing to stay forever.