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bg9.png The question for this issue is as follows: (Single-choice question) A control valve is connected in series within a piping system. Assuming that the total pressure difference across the system remains constant, what is the pressure difference across this control valve when it is fully open? A. Maximum B. Minimum C. Equal to the total system pressure difference D. Approximately equal to the total system pressure difference. The answer will be announced on November 2, 2017. Answers to the previous question: (Single-choice question) When a meter technician calibrates a meter, the absolute value of the basic error of the standard instrument used should not exceed ( ) of the absolute value of the error of the meter being calibrated. A. 1/3 B. 1/2 C. 3/4 D. 1/4. The answer is: A. ———————————————————————————————————————————————————————— Scoring criteria: 2 points for an incorrect answer; 3–8 points for an *incomplete* correct answer; 10 points for a correct answer accompanied by a detailed explanation; 12–15 points if a correct answer includes additional *explanations*. Please score according to these criteria. Note: If there are editing records after answering, only 1 point in wealth will be given to the participant. The time limit for answering is before the next question; 2 points are awarded if the answer is correct within two periods after the deadline, while no points are given if the answer is incorrect or if more than two periods pass. 5 wealth points will be deducted for each instance of consecutive malicious spamming. If malicious repeated posts occur for 2 consecutive times, 10 points will be deducted per instance, with no upper limit on the number of deductions. Any purely numerical content, purely emoji-based messages, or random letters that have no relation to the answer are considered malicious spamming; points will start to be deducted after one warning