旋涡泵主要应用在代替低比转数、低扬程的离心泵的场合。
查看答案
轴流泵启动时应在闸阀全开的情况下启动电动机，一般称为“开闸启动”。
A. 对
B. 错
Who is the narrator in Chapter 3 in Wuthering Heights?
A. Lockwood
B. Nelly
C. Zillah
D. Cathy
The story in Wuthering Heights is mainly about the intertwined conflicts between___:
A. Wuthering Heights and Thrushcross Grange.
B. Wuthering Heights and the Satis House.
C. Thrushcross Grange and Lowood.
D. Thrushcross Grange and Thornfield.
What does Lockwood’s first dream about the chaotic scene in the church reflect?
A. People’s general irreverence for religion.
B. Hypocrisy and harshness of religion.
C. Lockwood’s fear of religion.
D. Lockwood’s disordered mentality.
微信支付 
支付宝支付