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There are different 1_______ in the picture. Instrument A is known as a 2_______. It’s used for measuring pressure. It has a scale and a pointer. Instrument B is defined as scales. They have two pans. They are used for measuring 3_______. There are different types of scales. Instrument C is known as a ruler. It is used for drawing straight lines and different shapes. It has marks and 4_______ on it.
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_____ is a small electronic device containing a semiconductor and having at least three electrical contacts, used in a circuit as an amplifier, detector, or switch.