7. The _____ is a thin solid/integral structure made of ductile cast iron.
(A) cylinder
(B) crankshaft
(C) main bearing
(D) piston
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統計: A(286), B(180), C(177), D(529), E(0) #2887309
統計: A(286), B(180), C(177), D(529), E(0) #2887309