6. When the speed of a rear-drive car is increasing on a horizontal road the direction of the frictional force on the tires is:
(A) forward for all tires
(B) backward for all tires
(C) forward for the front tires and backward for the rear tires
(D) backward for the front tires and forward for the rear tires
(E) zero.

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統計: A(0), B(0), C(0), D(1), E(0) #3332065

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