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1.	The_extra_widening_is_the_sum_of$
A.	Mechanical widening and psychological widening
B.	Two times of mechanical widening
C.	Two times of psychological widening
D.	Mechanical widening ‚Äö√Ñ√∂‚àö√ë‚àö¬® physical widening
Answer» B. Two times of mechanical widening

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