【Pump Technology Edition: Daily Question】January 26, 2020 (Spring Festival bonus: 10 wealth points for those who answer correctly before the answers are revealed)

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85. When the two shafts are far apart and accurate transmission is required, ( ) should be used.  A. Belt drive B. Chain drive C. Gear drive. Answer to question 84 from yesterday: C. Compared with gear drive, worm drive has prominent advantages such as (C). A. High transmission power and efficiency; B. Low-cost materials and good interchangeability; C. Large transmission ratio. Answer to question 83 from the day before yesterday: B. For compressors whose operating medium is toxic or hazardous, or which can form explosive mixtures with air, (B) replacement should be carried out before the compressor starts operating normally. A. Carbon dioxide gas B. Nitrogen C. Oxygen (Answers are released the day before they are announced; 10 wealth points for correct answers before the announcement, 5 wealth points for correct answers after the announcement, and 3 wealth points for participation.)