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【简答题】
在图所示的摆动导杆机构中，已知曲柄AB以等角速度ω 1 =10rad/s转动，l AB =100mm，l AC =200mm，l CK =40mm。当φ 1 =30°、120°时，试用解析法求构件3的角速度ω 3 和角加速度α 3 。
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反馈参考答案：
举一反三
【单选题】Tom asked my friend ____.
A.
where was he from
B.
that the earth is bigger than the moon
C.
when did he come back
D.
not to be so angry
【简答题】已知{a n }是公比为2的等比数列，若a 3 -a 1 =6，则a 1 =______； 1 a 21 + 1 a 22 +…+ 1 a 2n =______．
【单选题】Tom asked my friend_______.
A.
where was he from
B.
that the earth was bigger than the moon
C.
when did he come back
D.
not to be so angry
参考解析：
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