问题
单项选择题
卧式水泵的安装高度等于（）到吸水井水面的垂直距离。
A、叶轮轴心线
B、叶片进口边中点
C、叶轮叶片转动中心
D、泵壳底部
答案
参考答案：A
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卧式水泵的安装高度等于（）到吸水井水面的垂直距离。
A、叶轮轴心线
B、叶片进口边中点
C、叶轮叶片转动中心
D、泵壳底部
参考答案：A
| 根据对话内容，选择恰当的句子补全下列对话。 | |
| Ann: Hello, Sam. 1.______ How are you doing? Sam: Fine. Thank you. And you? Ann: Pretty good. I was told that you would finish your middle school study. 2.______ Sam: I'm going to study the computer in the college. 3.______ Ann: My parents are hoping I will go to the music school, but I'm not sure. Sam: 4.______ Ann: Yes, I do love it. But I hate having to study music theory (理论). Sam: Why don't you ask your music teacher for advice? Ann: 5.______
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