问题
问答题 简答题
启动离心泵前为什么要灌泵？
答案
参考答案：
为了防止气缚现象发生。
搜题请搜索小程序“爱下问搜题”
启动离心泵前为什么要灌泵？
参考答案：
为了防止气缚现象发生。
| 完型填空。 | ||||
| When July comes, children know they'll have 1 exams and the school year will end soon. Boys and girls will have a nearly two months'holiday,and they'll leave school 2 train or by car to 3 to see their fathers and mothers. The summer holidays are the 4 time of the year for most children. The weather is usually good, so one can 5 most of his time playing outside. If one lives in the country, he can 6 into the woods (森林) and in the fields. If one lives in a big town, he can usually go to a park to play. The best place for a summer holiday is the 7 . Some children are 8 enough to live near the sea. But for the others who do not, if they have chance to stay at one of the big seaside towns for a week or two, they will talk about it all the following school year. Now, 9 makes children like the seaside so much? I think it's the sands (沙滩), the sea and the sun, not anything else. Of course, there are 10 new things to see, nice things to eat, and interesting things to do. But the feeling of sand under their feet, of salt water on their skin, and the feeling of the warm sun on their backs make them happier. | ||||
|