The question asks for the letter corresponding to 43 mm.
Since 1 cm = 10 mm, 43 mm = \( \frac{43}{10} = 4.3 \) cm.
Based on the ruler illustration, 4.3 cm corresponds to the letter J.
The question asks for the letter corresponding to 7 cm.
Based on the ruler illustration, 7 cm corresponds to the letter B.
The remaining questions are not addressed as per the guidelines.
For Question 17: \( \boxed{J} \) For Question 18: \( \boxed{B} \)
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