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【简答题】
在图示轮系中,已知蜗杆头数 Z1=1,蜗轮的齿数数Z2=50,圆柱齿轮齿数数Z2’=20,Z3=60,卷筒直径d=0.4m,若电动机转速n=1440r/min,试求重物G的上升速度V(速度单位用m/s,π取3.14),并标出电动机轴的转向。
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反馈参考答案：
举一反三
【单选题】如果关系R中有4个属性和3个元组，关系S中有3个属性和5个元组，则R×S的属性个数和元组个数分别是 ______。
A.
7和8
B.
7和15
C.
12和8
D.
12和15
【单选题】在unity中,RigidBody组件的 “Use Gravity”属性的作用是( )。
A.
使物体具有重力特性
B.
使物体具有碰撞特性
C.
使物体可以播放声音
D.
启用或禁用该物体
【单选题】刚体(Rigidbody)中可以使对象下坠的是哪个属性
A.
激活质量(Enabled Mass)
B.
使用重力(Use Gravity)
C.
适用质量(Mass Apply)
D.
场景重力(Scene.gravity)
【简答题】阅读理解。 Most people in Britain live in small family groups. More than a quarter of homes in Britain have only got one person in them. Some of these are old people but some are people of twenty or thirty...
【单选题】According to the speaker, what gives modem log homes their warm atmosphere?
A.
Their small size.
B.
Their rustic dirt floors.
C.
Their walls of rounded logs.
D.
Their sliding board windows.
【单选题】According to the speaker, what gives modern log homes their warm atmosphere?
A.
Their small size.
B.
Their rustic dirt floors.
C.
Their walls made up of rounded logs.
D.
Their sliding board windows.
【简答题】CharacterController和Rigidbody的区别
【单选题】At midnight they reached ________ small village, east of _______ Ever White Mountain.
A.
a the
B.
a 不填
C.
the the
D.
the an
相关题目：
【单选题】在unity中,RigidBody组件的 “Use Gravity”属性的作用是( )。
A.
使物体具有重力特性
B.
使物体具有碰撞特性
C.
使物体可以播放声音
D.
启用或禁用该物体
参考解析：
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