The pitch of spirals is limited to a range of ____________
A. 40 to 45mm
B. 25 to75mm
C. 15 to 30mm
D. 10 to 30mm
Answer:B
The pitch of spirals is limited to a range of ____________
A. 40 to 45mm B. 25 to75mm C. 15 to 30mm D. 10 to 30mm