问题
单项选择题
安装离心泵时，对于转速3000r/min的轴，与轴瓦的顶间隙，取轴径的（）。
A.1.0/100～1.5/100
B.1.5/100～2/100
C.2.5/100～3/100
D.3.5/100～4/100
答案
参考答案：B
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安装离心泵时，对于转速3000r/min的轴，与轴瓦的顶间隙，取轴径的（）。
A.1.0/100～1.5/100
B.1.5/100～2/100
C.2.5/100～3/100
D.3.5/100～4/100
参考答案：B
What’s a typical（典型的）day like in Buenos Aires（布宜诺斯艾利斯）? For Diego, who lives with his parents in a house in Buenos Aires, a school day starts 41 . If his mother doesn’t wake him up at 6:00 a.m., his dog Luna will. Diego 42 himself quickly and takes Luna for a walk. Then it’s time to get ready for school. Diego puts on his school clothes and eats a quick 43 . He slings（抛）his heavy schoolbag over his shoulder and gets onto the city bus for the 25 minutes’ 44 to school. Diego is in the seventh year of primary school. Classes start at 8:00 a.m. with math, followed 45 history and music. At 1:00 p.m., Diego and his friends have their lunch. After lunch, Diego heads to English class. This is one of his favorites, 46 the students practise English by writing e-mails to students in 47 countries. When the 48 class ends, Diego and his friends 49 the bus to a city park to play football. Then he’s back home to start on homework. If he finishes in time, Diego will cook dinner. His parents come home from work at about 8:00 p.m., and 50 they sit down to dinner. After dinner, Diego does some reading or watches TV before getting ready for bed!
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