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【单选题】
Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?A.
Oil is discharged from the impeller through the outlet
B.
Gravity causes the oil to flow toward the discharge
C.
The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
D.
The discharge capacity varies directly with the speed of the impeller
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举一反三
【多选题】下列事件，承包人不可以向发包人提出索赔的有（ ）。
A.
施工中遇到地下文物被迫停工
B.
发包人要求提前竣工，导致工程成本增加
C.
施工机械大修，误工5天
D.
施工方案调整，造成工期延误
【单选题】Which one is the most appropriate title of the article?
A.
Yahoo!'s X-Files
B.
Yahoo!'s Categories
C.
Yahoo!'s Sub-categories
D.
Movies and Music Online
【简答题】A．10 weeks. B．20 weeks. C．12 weeks. D．13 weeks.
【单选题】气管管壁可分为三层，由内向外分别是
A.
粘膜、肌层和外膜
B.
上皮、固有层、粘膜肌
C.
粘膜、粘膜下层和外膜
D.
粘膜上皮、粘膜肌和外膜
E.
上皮、粘膜下层和外膜
【单选题】When will the Motorola handsets with the service of Yahoo Go appear in the market?
A.
First half of 2007.
B.
Second half of 2006.
C.
July 2005.
D.
Late 2007.
【简答题】A．Three weeks. B．Two weeks. C．Four weeks. D．Five weeks.
【单选题】气管管壁可分为三层,由内向外分别是
A.
粘膜、肌层和外膜
B.
上皮、固有层、粘膜肌
C.
粘膜、粘膜下层和外膜
D.
粘膜上皮、粘膜肌和外膜
E.
粘膜、固有层和外模
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