【Pump Technology Edition: Daily Question】January 16, 2020 (Spring Festival bonus: 10 Wealth points for those who answer correctly before the answers are revealed)

2020-01-16View Original

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75. The coefficient of thermal expansion of the piston material is ( ) that of the piston pin. A, greater than B, equal to C, less than. Answer to the question from yesterday: A. 74. The piston ring is not a complete circular ring; it is open-shaped, and its diameter in its free state (A) is equal to the cylinder diameter. A、Greater than B、Equal to C、Less than (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)

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【Pump Technology Edition: Daily Question】January 16, 2020 (Spring Festival bonus: 10 Wealth points for those who answer correctly before the answers are revealed)

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