21. The first time you are going to operate an unfamiliar high-temperature tube furnace (or a high-pressure autoclave), what would you do?
(甲) Just follow what senior lab members told me—after doing it once, I'll know how.
(乙) Read the SOP/manual first and confirm the safety limits (temperature, heating/cooling rate, atmosphere, pressure).
(丙) Perform a dummy run (blank run) to check that the temperature control and gas flow are functioning properly.
(丁) Set all parameters to the maximum to test the limits.
(戊) Verify ventilation, exhaust/effluent handling, emergency shutoff, and required personal protective equipment (PPE) in advance
(A) 乙丙戊
(B) 丙丁
(C) 甲丁戊
(D) 乙丁

(E) 甲乙丙丁戊