水泵汽蚀余量指泵进口处，单位重量液体所具有超过饱和蒸气压力的

搜题请搜索小程序“爱下问搜题”

问题单项选择题

水泵汽蚀余量指泵进口处，单位重量液体所具有超过饱和蒸气压力的富裕能量。一般用它来反映的泵是（）。

A、离心泵、锅炉给水泵

B、轴流泵、锅炉给水泵

C、混流泵、污水泵

答案

参考答案：A

填空题

根据语境和句意，从括号中选择一个可填入句子的正确选项，并将答案填写在答题卡上指定的位置。

小题1:The cook added salt into the soup but it still wasn’t_______ enough. (salt, salty)

小题2:The story book is interesting and it was______ by Mark Twain. (written, writing)

小题3:“What do people in Korea do when they meet _______the first time?” “They usually bow.” ( in, for)

小题4:Singapore has a night_______, you can watch many kinds of animals there.(zoo, party)

小题5:Every year, Guiyang attracts larger numbers of tourists, ______in summer.( especial, especially)

判断题

清除焊件表面的铁锈、油、漆等污物，其目的的是提高焊缝金属的强度。（）