Whichstatementistrueaboutmouseevents?（）A.The cursor style can be set to CAUTION. B.Double-clicking a mouse button can potentially fire six mouse event triggers. C.The values for the SYSTEM.MOUSE_BUTTON_PRESSED system variable can only be 1 or 2. D.Click and double-click button actions can only detect if the mouse is positioned in an item.

单项选择题

Which statement is true about mouse events? （）

A.The cursor style can be set to CAUTION.
B.Double-clicking a mouse button can potentially fire six mouse event triggers.
C.The values for the SYSTEM.MOUSE_BUTTON_PRESSED system variable can only be 1 or 2.
D.Click and double-click button actions can only detect if the mouse is positioned in an item.

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