问题
单项选择题
下列哪一种卸油方法需要真空系统进行引油作业？（）
A.泵卸法；
B.潜油泵卸油；
C.压力卸油；
D.下部卸油。
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
下列哪一种卸油方法需要真空系统进行引油作业？（）
A.泵卸法；
B.潜油泵卸油；
C.压力卸油；
D.下部卸油。
参考答案：A
| 完形填空。 | |||
| April Fool's Day April Fool's Day is a western festival. No one 1 exactly when and how April Fool's Day began. However, there are some stories about 2 it came into being. One story 3 like this: in the sixteenth-century France, the start of the new year was on April first. It was celebrated 4 much the same way 5 it is today with parties and dancing into the late hours of the night. Then in 1562, Pope (教皇) Gregory introduced a new calendar for the Christian world, and the new year fell on January first. There were some people, 6 ,who hadn't heard or didn't believe the 7 in the date, so they 8 to celebrate New Year's Day on April first. 9 played tricks on them and called them"April fools". They tried to make them believe that something false was 10 . In France today, April first is called "April Fish". French children fool their friends by taping a paper fish to their friends' 11 .When the "young fool" 12 this trick, the prankster (恶作剧者) shouts"April Fish!" Today Americans play small tricks on friends and strangers alike on the first of April. One 13 trick on April Fool's Day is 14 to a friend's shoe and saying, "Your shoelace is untied (你 的鞋带开了)．"School children might tell a classmate that school has been canceled (取消). 15 the trick is, if you fail for the joke the prankster shouts "April Fool!" In Britain today, on the first of April, even 51 newspapers, radio and TV programs tell big lies. You 52 read a science 53 showing that doctors have found a way to cure (治疗)AIDS, 54 you would probably listen to a piece of news about an UFO 55 on an island. | |||
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