6. If the ______ occurs due to the wears of piston rings and cylinder liner, a gradually rising
pressure in the crankcase of trunk-piston engine could appear.
(A) blow-by
(B) engine knocking
(C) vibration
(D) loud sound
詳解 (共 1 筆)
未解鎖
6.由於活塞環和缸套的磨損而發生 ___...