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【单选题】
下列属于管道运输优点的有A.
可双向运输
B.
一次固定投资小
C.
不受气候影响，可连续作业
D.
只适用于特定的少数气体、液体和粉状固体
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反馈参考答案：
举一反三
【单选题】When was the bridge built over the fiver Granta?
A.
In the 9th century.
B.
In the 13th century.
C.
In the 15th century.
【单选题】When was the bridge built over the river Granta?
A.
In the 9th century.
B.
In the 13th century.
C.
In the 15th century.
【简答题】A．In the f9th century. B．In 1973. C．In 1998. D．In the 21st century.
【简答题】____是表征物体长度随温度变化的物理量。
【单选题】Around what time did the university begin to appear?
A.
In the 9th century.
B.
In the 13th century.
C.
In the 15th century
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