问题
问答题 简答题
计算机：已知某泵的汽蚀余量为5.3米，所打介质的比重为800kg/m3，吸入管的阻力损失为3米，求该泵的安装吸入高度为多少米。
答案
参考答案：
H吸=P/r-H蚀-H损=4.2米
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计算机：已知某泵的汽蚀余量为5.3米，所打介质的比重为800kg/m3，吸入管的阻力损失为3米，求该泵的安装吸入高度为多少米。
参考答案：
H吸=P/r-H蚀-H损=4.2米
Bill, a thirteen-year-old boy, thought he had grown up to be a man. But his parents told him, “You won’t be a real man until you begin to 1 helping others.” One morning, his parents gave him some money to 2 some milk for them. Outside a shop he saw a homeless old man who looked very sick. Bill went to him and asked, “ What’s wrong with you?” The old man answered, “I’m 3 . I haven’t had any food for two days.” At the thought of his parents’ words, Bill said to the old man, “Let’s go to the 4 .” When they got there, Bill asked the 5 to bring out bread and coffee to the old man. The old man finished the meal quickly. After the waiter 6 the plate and the cup, the old man said, “Sorry for giving you too much 7 . I’m fine now. I’ll 8 forget your kindness! You are a very good young man” Bill was 9 when he heard this. Just when he wanted to pay for the meal, the waiter came. Bill and the old man learned 10 that he food was free because it was the birthday of the boss, and they were the first customer that day.
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