Auto & Shop InformationCâu 108 / 120
What is the main purpose of engine oil?
a.To cool the cabin
b.To power the lights
c.To inflate the tires
d.To lubricate moving parts
Giải thích
Engine oil lubricates moving metal parts to reduce friction and wear. It also helps carry away heat and keep internal components clean.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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