2. The market price is based on the market price. The market price changes at any time. It is possible that you will see it as 200, and it will become 2 10 when placing an order, and so on. So, according to the market price, that is, what is the market price, there is a price limit, that is, the price can only be set at this price or a price better than this price.

The daily limit means that there is a limit to today's price. Under normal circumstances, this price is set according to the closing price of the previous trading day, with a fluctuation of 4%. After reaching this price, the transaction stopped, and everyone could not trade until the next day. Of course, there are many details, so I won't say much here.

I'm not sure about placing an order at a stop-loss price, so I can't answer it here.

Locking is to buy the same number of buy orders and sell orders for the same contract. No matter whether the price goes up or down later, for this bill, the profit and loss cancel each other out, which is similar to locking the price difference, so it is called lock warehouse, also called lock order.

3. If the order has been placed but there is no deal, no one will answer it. Usually, if you speculate, you will find the main contract with the largest turnover, usually 1, May and September.