Positive SSL
1 一正齒輪的齒數為42,節圓直徑為126 mm,則該齒輪的模數M 與周節PC 各為多少?
A M = 2,PC = 2πmm
B M = 3,PC = 3πmm
C M = 4,PC = 4πmm
D M = 5,PC = 5πmm

M=D/T=126/42=3mm

Pc=πM=3πmm