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【多选题】
下面有关聚合物熔体流变性能的叙述,正确的有( )。A.
大多数聚合物熔体在通常的剪切速率范围内表现为假塑性非牛顿流体
B.
在极低的剪切速率范围内,表现为牛顿流体
C.
在通常的速率范围内,黏度随剪切速率升高而增大
D.
黏度随温度升高而下降
E.
在无穷大剪切速率下,在恒定温度下的黏度为常数
F.
:ABDE
G.
:多选题
H.
r>
I.
、关聚合物黏流活化能的描述,正确的是( )。
J.
刚性聚合物具有较高的黏流活化能 K. 柔性物具有较高的黏流活化能 L. 黏流活化能越大,熔体黏度越高
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【单选题】Which of the following statements about the 55 men framing the Constitution is true?
A.
Thomas Jefferson was not among them.
B.
All of them were famous.
C.
All of them contributed much to the framing
D.
George Washington and Benjamin Franklin were among them.
【单选题】Which of the following statements shows that “the Constitution is superior to all other laws?”
A.
if a law conflicts with the Constitution, it will become invalid.
B.
the Constitution is earlier than any other law in American history.
C.
the Constitution can replace other laws.
D.
other laws originate from the Constitution.
【简答题】If there were more trees on the earth, there would be less p____________.
【单选题】Some policemen were sent there to ________ the villagers _________ down the trees.
A.
keep; cutting
B.
prevent; cutting
C.
prevent; to cut
D.
stop; to cut
【判断题】The American Constitution is the first written constitution in the modern world.
A.
正确
B.
错误
【单选题】— Do you plant trees in spring? —Yes. Many trees in our city every year. [ ]
A.
are planting
B.
are planted
C.
were planted
【单选题】Many of today ’ s superstitions (迷信) are based on old beliefs (信念) . K nocking on the wood for good luck comes from the old idea that spirits (精灵) lived in trees. B reaking a mirror is bad luck becaus...
A.
B reaking a mirror is bad luck because people once thought that reflections were part of a person ’ s spirit.
B.
Many of today ’ s superstitions （迷信） are based on old beliefs （信念） .
【判断题】The British Constitution is the first written constitution in the modern world.
A.
正确
B.
错误
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