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【单选题】
下列关于离心泵说法错误的是 。A.
离心泵产生的最大排压有限,故不必设安全阀
B.
泵的轴功率随流量增大而增加
C.
泵在额定工况附近工作较高的效率
D.
离心泵不宜用做船用水泵和较大油轮的货油泵
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举一反三
【单选题】—Is the old woman ________? —Yes, but she doesn't feel ________. [ ]
A.
lonely; alone
B.
lonely; lonely
C.
alone; alone
D.
alone; lonely
【单选题】Although some old people live near their sons or daughters, ______.
A.
they still feel lonely
B.
they want to move to other places
C.
they have no time to look after the young people's children
D.
they like to live with their own brothers and sisters
【简答题】a____ vt. ( fml. ) give sb. information about sth. 介绍;使认识;使了解
【单选题】We need friends to ________, or we will feel ________.
A.
chat, alone
B.
chat with, lonely
C.
speak, lonely
D.
talk with, alone
【简答题】vt. (fml.) give sb. sth. or allow them to have sth. that they have asked for 给予;准予n. [C] an amount of money given to sb., esp. by the government, for a particular purpose (尤指政府发给的)补助金,拨款
【单选题】－How do you do? －_____. [ ]
A.
Hello.
B.
How are you?
C.
How do you do?
D.
I'm fine, thank you
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