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【多选题】
连杆机构特点（）。A.
运动副都是低副，低副为面接触，所以耐磨损，承载大
B.
可以实现不同运动规律和特定轨迹要求
C.
设计比较复杂，不易精确的实现复杂的运动规律
D.
设计简单，易实现复杂的运动规律
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举一反三
【单选题】When the fire broke out in the shop, people ran for the exists, in fear.
A.
screamed
B.
scream
C.
screaming
D.
having screamed
【简答题】影响旅游者选择旅行方式的因素有( ) 、( )、( )、( )。
【简答题】影响旅游者选择旅行方式的因素有旅行距离、运输价格、____、和旅行偏好和经验 。
【单选题】When the fire fighters heard a lady for help in the burning house, they rushed into save her.
A.
to ask
B.
asked
C.
crying
D.
to cry
【单选题】Only when the fire was under control to return to their homes.
A.
the residents would be permitted
B.
had the residents been permitted
C.
would the residents be permitted
D.
the residents had been permitted
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