9. What purposes is not compressed air used on board ship?
(A) Starting engine
(B) Supply engine for burning
(C) For pneumatic tools
(D) Cleaning equipment
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統計: A(136), B(717), C(208), D(203), E(0) #2778104
統計: A(136), B(717), C(208), D(203), E(0) #2778104