Fig. 4.2 is a main interface window of this virtual heat calculator, and when the "gasoline machine" button is pushed, it enters the parameter input screen of the gasoline machine, and when the "diesel engine" button is pushed, it enters the parameter input screen of the diesel engine, and ends Then, the virtual heat calculator is terminated.<br>The image loaded into the form specifies the default effect picture path by changing the picture's picture attribute. The three button features of the "gasoline", "diesel engine" and "logout" are achieved through the label control 3 Click event, and the three buttons have certain beautification functions. When the mouse moves to the button, the button drops down and the mouse leaves and returns to the natural state. Press the button to display the function window corresponding to the button character.<br>4.3, design of a thermal calculation module for gasoline machine combustion process<br>4.3.1 design of parameter input window for gasoline machine<br>Figure 3 shows the parameter input window for this virtual heat calculator gasoline machine heat calculation module. Because the heat calculation of the gasoline machine which uses natural gas as an alternative fuel is complicated, the natural gas gasoline machine is not removed and is actually researched. This parameter input window is a self check button to check whether or not an input error has occurred after the user confirms that the input parameter has been completed, or if there is no unnecessary trouble after the input parameter has been completed .<br>
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