阿摩線上測驗
15. A mechanical attack on the metal surface may be due to a disturbance in the flow of water
over the blade arising from damage, in which case it tends to be localized in the form of comets.
The erosion may be caused by which of the following reason?
(A) General
(B) Galvanic
(C) Gravity
(D) Cavitation
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統計： A(119), B(104), C(155), D(434), E(0) #1359043
統計： A(119), B(104), C(155), D(434), E(0) #1359043
