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【单选题】
石油的密度温度系数是指 (41676:第十一章_液体散货运输:2105)A.
不同温度时密度的比值
B.
石油不同温度时密度的差值
C.
标准温度下,油温变化1°时石油密度的变化量
D.
标准温度下,油温变化1°时石油密度的变化率
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【单选题】设等差数列{a n }的前n项和为S n ，若a 10 ＜0，a 11 ＞0，a 11 ＞|a 10 |，则 [ ]
A.
S 19 ＜0，S 20 ＜0
B.
S 19 ＞0，S 20 ＜0
C.
S 19 ＞0，S 20 ＞0
D.
S 19 ＜0，S 20 ＞0
【简答题】According to this book, of the 2201 passengers on board the Titanic, 1490 died in the icy waters of the Atlantic Ocean. Only 711 people ______ and finally reached New York.2. When Barbara was depresse...
【单选题】Screening of risk events for potential risk is known as _____ .
A.
problem structuring.
B.
risk identification
C.
risk quantification
D.
risk modeling
E.
risk mitigation
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【单选题】Seeing the happy ______ of boys playing on the playground, I can’t help thinking of my childhood.
A.
sign
B.
act
C.
scene
D.
view
【单选题】I finish doing my homework with the help of Paul, so I must ____ to him.
A.
s ay thanks
B.
say hello
C.
say sorry
【单选题】113 Screening of risk events for potential risk is known as _____ .
A.
problem structuring.
B.
risk identification
C.
risk quantification
D.
risk modeling
E.
risk mitigation
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