Answer:
R717
Explanation:
For an equipment room having R717 in the systems, a refrigerant detector is not needed. Provided the mechanical ventilation systems are working continuously so that the leaked refrigerant is being thrown out of the room
a drum, which makes sound when a mallet hits its surface
a cymbal, which makes sound when it is crashed against another cymbal
a trumpet, which makes sound when air is blown into a brass mouthpiece
a violin, which makes sound when a bow slides across strings
The percussion instruments are a drum, which makes sound when a mallet hits its surface and a cymbal, which makes sound when it is crashed against another cymbal.
Percussion instruments generate sound when struck by an object. Among the options provided, the drum and the cymbal are indeed percussion instruments. A drum produces sound when a mallet or stick hits its surface, causing vibrations that create the characteristic drumming sound. Similarly, a cymbal produces sound when it is crashed against another cymbal or struck with a mallet.
So, the percussion instruments that fit the description of making sound when struck are the drum and the cymbal. These instruments belong to the percussion family, which is characterized by its reliance on impact to produce musical tones.
Read more about percussion here: brainly.com/question/31595045
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Answer:
I believe that the percussion instruments are the drum and cymbal.