Acoustic windows that are portions of an ultrasonic sensor used to measure a rate of flow of a fluid are wetted whenever the fluid is present. The head and the shaft are made of hollow aluminum tubing with a series of ripples. The method includes requesting the non-MIDlet application and determining a type of the non-MIDlet application. An oscillation circuit generates in response to the self-refresh mode signal generates a basic time period. When b or c is 2, two R1 or two Z may be each the same or different) and a curable composition including this polymer, and a sealant and an adhesive in which the curable composition is used.