From the perspective of changes in rights and interests, it is the same.

But after closing the position, you don't have a certificate of deposit. After closing the position with the opposite amount, you have a double order in your hand, which takes up double the margin. When you close the position again, you have to pay double the handling fee.

The "embedded" list is equivalent to a pre-written delegation list. When the market comes, click "Send", which is equivalent to handing in documents. You may have "sent" it in advance, so the transaction will take place immediately.

At present, the "automatic stop loss" function of trading software is not mature. If you want to stop loss at a certain price, you can quote manually and let the sales department control it.

Buy a primary contract to open a position first, and then buy a primary contract to open a position after the price changes. When calculating the position cost, the two prices will be calculated equally. It will be calculated separately when closing the position. Generally, positions will be opened first (first in, first out).