【Daily Question: Pump Equipment】Fill-in-the-blank and True/False Questions, May 14, 2019

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bk14.jpg Rules for answering questions and management: 1. If all answers to a question are incorrect, participants will receive a reward of 2 wealth points； 2. In the answer section, a correct answer earns 5 wealth points ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. Fill-in-the-blank question: In O-rings that comply with standard GB3452.1, if the marking is φ97.5x3.55, then φ97.5 refers to the ( ) of the O-ring ； A: Outer diameter B: Medium diameter C: Inner diameter D: Cross-sectional diameter. 2. True or False: O-rings used in mechanical seals, due to their small diameter sizes and the large number of available specifications, usually follow the O-ring specifications specified in standard JB7757.2. ( ) Answer: 1, C ； 2. Correct.