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【简答题】
叶片式泵按其比转速从小到大 , 可分为 __ __ 泵、 __ __ 泵、 __ __ 泵。 2 、离心泵的设计工况点是 ___ __ 最高点。 3 、离心泵的极限工况点是 __ ___ 最大点。 4 、水泵的效率是水泵的 ___ __ 功率与 ___ _ 功率的比值。 5 、运转中的水泵装置 , 其总扬程约等于 ___ __ 与 _ ___ 的读数(折算为 mH2O )之和。 6、允许吸上真空高度是指水泵在标准状况下运转时 , 水泵所允许的 __ ____ 的真空值,一般常用它来反映离心泵的吸水性能。
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举一反三
【单选题】The police is offering a(n) _________ of $2000 to anyone who will provide information about the lost boy.
A.
praise
B.
prize
C.
reward
D.
award
【单选题】You are distracted because you have just remembered something important you have forgotten to say. You realize that people are looking at you, but you have no idea of what has just been said. Which of...
A.
I’d just like to add one more point that ….
B.
Sorry I forgot something important here, let me think for a while.
C.
Before we move to the next point, may I check your understanding of what I just said?
D.
Perhaps I didn’t make my points complete. There is another very important point I‘d like to illustrate.
【单选题】'Physicians who practice in a group reduce their own expenses and provide patients with a wider range of services.' in this sentence 'expenses' can be explained as ______.
A.
income
B.
spending
C.
time
D.
energy
【单选题】In those days, our ________ concern was to provide people who were stopped by the snowstorm with food and health care. [ ]
A.
normal
B.
constant
C.
permanent
D.
primary
【单选题】This quote “If You Have Your Health and Your Family, You Have Everything” came from the author's , a man of great wisdom. If you have plenty of money but not these two things, you don’t have much.
A.
95-year-old father-in-law
B.
98-year-old mother-in-law
C.
95-year-old father
D.
95-year-old mother
【简答题】I am not unmindful that some of you have come here out of great trials and tribulations. Some of you have come fresh from narrow jail cells. Some of you have come from areas where your quest for freed...
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