13. Put on _____ in engine room during running, because it can cause hearing loss.
(A) eyeshade
(B) gloves
(C) safety helmet
(D) ear protection
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統計: A(42), B(95), C(117), D(726), E(0) #3126414
統計: A(42), B(95), C(117), D(726), E(0) #3126414