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【多选题】
下列属于政府投资建设需要考虑的因素A.
关系国计民生的重点项目
B.
关系人民生活福利的项目
C.
垄断的需要
D.
维护国家安全的需要
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【单选题】In purification, there is no fuel oil in the clean oil outlet.It could be caused by _____. I.too high temperature of the dirty fuel oil; II. too low temperature of the dirty fuel oil; III. Clogged fil...
A.
I
B.
I.II.III
C.
II.III
D.
II
【单选题】Which one is not included in the water pollution purification materials?
A.
Redox material
B.
Precipitation separation material
C.
Solid liquid separation material
D.
Purification catalyst
【单选题】To receive oil residues from the purification of fuel and lubricating oils in the machinery spaces, what kind of tank(s) should be provided on board?
A.
bilge tank
B.
sludge tank
C.
overflow tank
D.
oil collecting tank
【简答题】城市道路分为哪几类?
【简答题】城市道路有哪些功能？城市道路分为哪几类？
【单选题】In purification, light phase is escaping together with the heavy one. This indicates that ____.
A.
the bowl is clogged
B.
the liquid seal is broken
C.
the bowl is clogged, or the liquid seal is broken
D.
the throughput is too low
【单选题】The gel below illustrates the purification of the RecA protein from E. coli. This gel was loaded from the top. Which statement BEST describes how proteins “run” in an SDS gel?
A.
The proteins are separated primarily by molecular weight—the largest MW proteins are on the bottom, and the smallest are on the top.
B.
The proteins are separated primarily by molecular weight—the smallest MW proteins are on the bottom, and the largest are on the top.
C.
The proteins are separated primarily by charge—the protein with the smallest pI is on the top, and the protein with the largest pI is on the bottom.
D.
The proteins are separated primarily by charge—the protein with the largest pI is on the top, and the protein with the smallest pI is on the bottom.
E.
The proteins are separated primarily by their propensity to precipitate—as electrophoresis progresses, the heat generated by the current denatures proteins faster or slower. The slowest to denature is on the bottom, and the fastest to denature is on the top.
【简答题】城市道路分为哪几类?
【简答题】城市道路分为几类 ?
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