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The Stiffness of a Manual Toothbrush Is Dependent on Its

Question 12

Multiple Choice

The stiffness of a manual toothbrush is dependent on its filament characteristics.Longer and narrower filaments tend to be characteristic of stiffer toothbrushes.


A) Both statements are true.
B) Both statements are false.
C) The first statement is true,but the second statement is false.
D) The first statement is false,but the second statement is true.

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