【单选题】That the author mentions the old Romans is ______.
A.
to compare the old Romans with today's people
C.
to show human beings in the past know nothing better
D.
to indicate human beings used to be bloodthirsty
【单选题】That the author mentions the old Romans is ______.
A.
To compare the old Romans with today's people
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
【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。