The time required for a lighted aid to com
题型:单项选择题
问题:
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the().
A.Set
B.Frequency
C.Period
D.Function
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the().
A.Set
B.Frequency
C.Period
D.Function