One question per day; no prize for correct answers, it’s just for entertainment.
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6. When grinding and polishing red lead powder for planar use, it must be mixed using (?????). ?A. Engine oil????B. Kerosene????C. Water? Answer to the previous question: B. Before stopping a centrifugal pump, (B) should be turned off first. ?A、Inlet dam??B、Outlet dam??C、Inlet and outlet dams
You might as well become a moderator; that way, the visibility of the daily question will increase. :lol
You’re being too kind to me; I just want to gradually get used to learning*