【Pump Technology Edition: Daily Question】January 29, 2020 (Spring Festival bonus: 10 wealth points for those who answer correctly before the answers are revealed)

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88. The power for the pneumatic clamping device comes from compressed air, and the pressure of this compressed air is generally (    ) MPa.  A、0.4～0.8      B、0.5～0.8     C、0.5～1         D、1～1.5 The answer to question 87 yesterday: B. 87. When assembling direction control valves, it is necessary to grind the valve core in the valve body, and the clearance between them should be strictly controlled within (  B ) mm. A、0.01 B、0.15   C、0.02 D、0.015  Answer to question 86 from the day before yesterday: A. 86. The relief valve is used to regulate the constant pressure in the hydraulic system (A   ). A. Pressure B. Flow rate C. Speed D. Direction (Answers are released the day before they are made public; 10 wealth points are awarded for correct answers before the release, 5 wealth points for correct answers after the release, and 3 wealth points for participation.)