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1. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
the body of the instrument
D.
a column of air
E.
an electrical signal
2. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
3. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
4. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
5. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
6. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
7. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
8. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
9. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal
10. 
Say what the vibrating element is.
A.
The strings
B.
The membrane
C.
The body of the instrument
D.
A column of air
E.
An electrical signal