One Question per Day on Synthetic Ammonia (Series 44)

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I. Multiple-choice questions (each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets). Continuing from Series 43, 216: In the desulfurization solution using tannin method, ( ) can oxidize Na2V4O9 to NaVO3. A、NaHCO3 B、TQ C、THQ D、Na2CO3 217. During CO conversion, the catalyst with sulfur resistance is ( ). A. Ferro-chromium series B. Low-temperature CuO C. Cobalt-molybdenum series D. Nickel catalyst 218. The several types of fixed-bed gasifiers that are commonly used in medium-sized nitrogen fertilizer plants do not include the following ( ) type of furnace. A. 2.74 meters B. 3 meters C. 3.6 meters D. 5 meters 219. During CO conversion, the liquid levels in the saturation tower and the hot water tower are generally controlled at （） of the gauge height. A、1/3～1/2 B、1/4～1/3 C、1/2～2/3, D、1/3～2/3 220、The duration of one working cycle in the intermittent process for producing semi-water gas is generally （ ） minutes. A, 3 B, 6 C, 8 D, 10 Answer: BCDCA Scoring criteria: 3 points for participation, 1 point for each correct answer, and 1 additional point for hiding the answer. It should be specifically noted that, in order to help everyone remember the practice of hiding answers, starting with this daily question, requests will occasionally be made for respondents to hide their answers. If the answerer is not hidden, they must participate in scoring. For methods to hide posts, see: http://bbs.hcbbs.com/thread-1551107-1-1.html