问题
填空题
泵的水力损失主要是流体在叶轮和泵体流道内的（） 、（） 和扩散损失。
答案
参考答案：摩擦损失;冲击损失
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泵的水力损失主要是流体在叶轮和泵体流道内的（） 、（） 和扩散损失。
参考答案：摩擦损失;冲击损失
| 根据句意，从方框内选择合适的单词填空。 | |
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| 1. We have _____ watched such an exciting football match before. 2. Lily's grandmother has been dead _____ a few years. 3. My sister is going to Canada _____ a few days. 4. _____ you have got everything ready, please let me know. 5. —How long have you been like this? —_____ last night. |