问题
单项选择题
在流量相同的情况下,()管中产生水击的压强值相对最大。
A、DN50mm
B、DN100mm
C、DN150mm
D、DN200mm
答案
参考答案:A
在流量相同的情况下,()管中产生水击的压强值相对最大。
A、DN50mm
B、DN100mm
C、DN150mm
D、DN200mm
参考答案:A
从对话后的7个句子中选出5个完成对话。 | |
A: Can I help you? B: _______(1) A: How many exercise-books and pens do you want? B: Eight exercise-books and five pens. A: _______(2) B: Oh, do you have any rulers? A: Yes, we do. How many rulers do you want? B: _______(3) A: _______(4) B: _______(5) A: They are 36 yuan and 95 fen. B: Here's the money. A: Thanks. Goodbye!
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