19.A U-shaped tube open at both ends contains water and a quantity of oil occupying a 2.0-cm length of the tube as shown in the figure. If the oil's density is 80% of water’s, what's the height difference h?

(A) 0.2 cm
(B) 0.4 cm
(C) 0.6 cm
(D) 0.8 cm
(E) 1.6 cm

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統計: A(1), B(3), C(0), D(0), E(0) #3427019

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