Question
Fill in the blanks.
170, 172, 174, 176, 178, (a) _____ , (b)  _____
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Fill in the blanks.
170, 172, 174, 176, 178, (a) _____ , (b)  _____