【Daily Question】20150801 Valve operation knowledge (2 wealth points for replying, +3 wealth points for getting it right)

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To increase popularity in the boiler area and meet the demands of the region, the 【One Question per Day】 campaign is launched to foster technical exchanges, liven up the atmosphere, and offer rewards; all fellow sailors are welcome to participate actively. When two check valves are connected in series, they should be opened one after the other: the first valve first, followed by the second valve. ( ) Reply in the comments with the answer you think is correct (for true/false questions, an additional 3 points will be given for a correct answer). 1. Participating in answering questions + 2 wealth points (set to automatically add wealth) ； 2. No additional points will be given for incorrect answers; comments will provide the correct answer for reference ； 3. +3 points to wealth if the answer given is correct ； 4. When responding, provide a detailed explanation and analysis of the question or answer; depending on the quality of the response, an additional reward of 3 to 15 points in wealth will be given ； 5. Replies with correct answers and accurate explanations will be designated as the best reply (best assistance). Note: We will close this post after 72 hours to reveal the answers and explanations, as well as the best response (the best help provided).