21. Most dry-chemical fire extinguishers have a built-in _______.(A) temperature gauge(B) volume gauge(C) pressure gauge(D) vacuum gauge

25. Overflow: Escape of oil or liquid from a tank because of a twofold condition as a result of overflowing, thermal expansion, change in vessel trim or vessel movement. 標題’Overflow’中文技術術語為 ___________。 (A) 駛向 (B) 過熱 (C) 應答 (D) 溢流