已知一铰链四杆机构 ABCD, l AB =25mm,l BC =35mm, l CD = 50mm, l AD =30mm,且AD为机架,BC为AD的对边。那么,此机构为( )。
A.
双曲柄机构
B.
曲柄摇杆机构
C.
双摇杆机构
D.
固定桁架
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