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【单选题】
· 首横缆或前横缆的作用是( )。A.
防止船舶后移；Ⅱ.防止船首移动；Ⅲ.防止船尾贴靠码头损伤。
B.
Ⅰ
C.
Ⅰ，Ⅱ
D.
Ⅰ～Ⅲ
E.
Ⅱ，Ⅲ
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【单选题】In the architectural history, Romans _________.
A.
found a natural building material that can be used to produce concrete
B.
were the first people who could produce concrete
C.
found a truly waterproof cement
D.
contributed most to the development of architecture
【简答题】下列属于铁路货物运输优点的是()。
【单选题】That the author mentions the old Romans is ______.
A.
To compare the old Romans with today's people
B.
to give an example
C.
to show human beings in the past know nothing better
D.
to indicate human beings are used to bloodthirsty
【简答题】六轴工业机器人的手动操作有单轴、线性、（ ）三种运动模式
【单选题】It can be inferred form. the passage that______.
A.
the Romans were bored by their numberical system
B.
the Romans invented abaci
C.
the Romans were very rigid
D.
the Romans didn't want to learn Greek mathematics
【简答题】六轴工业机器人的手动操作有（ ）、线性、重定位三种运动模式。
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