As we know, the form of block diagram questions is in the form of selection or filling in the blanks, which accounts for a small proportion. There are two points about block diagram checking: the first is to understand the concept of block diagram and know how it works, which has nothing to do with what is in the block diagram; The second is to examine the contents in the block diagram, such as series summation. To do this, we must first master the basic solution of mathematical knowledge that may be the content of the block diagram. This knowledge is often recursive, discrete, additive and integrable, and often has a limited number of cycles. The most obvious thing that conforms to this feature is the sequence, and then there may be a dichotomy to find the root of the equation. For example, jumping out of the approximate range of loop output root after five bisections, etc ... Second, master the common block diagram model and know how the selection loop works ~ In fact, block diagram is the embodiment of programming idea, and programming lies in the orderly execution of commands, so you can understand how it works as long as you analyze it along the block diagram ~ Finally, I want to emphasize that sometimes there may be simple skills, such as finding the result every three times in the loop and so on. ...