【Weekly 3 Questions, Question 8】2017.8.26

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This post was last edited by xh8618 on 2017-8-26 08:20 (Multiple-choice question). Regarding the functions of valve positioners, which of the following descriptions are correct? ( ) A. Change the flow characteristic of the control valve. B. Change the direction of fluid flow. C. Enable step control. D. Prolong the service life of the control valve. Note: If the question is ambiguous, please contact me privately; however, no detailed explanations for tricky questions will be provided. The answers are A and C. —————————————————————————————————————————————————————————————— The question is valid for one week; no scoring will be given after that period, and the answers will be displayed automatically thereafter. The deadline is 207.09.2. Scoring criteria: 2 Wealth points for incorrect answers; 3–6 points for *incomplete* correct answers; 8 Wealth points for correct answers accompanied by detailed explanations; 10–15 Wealth points for correct answers with additional *complementary* explanations. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings.