铰链四杆机构ABCD中，AB为曲柄，CD为摇杆，BC为连杆。若杆长lAB=30mm?xml:namespace>，lBC=70mm，lCD=80mm，则机架最大杆长为（ ）
A. 80mm
B. 100mm
C. 120mm
D. 150mm
查看答案
杆长之和条件是指：铰链四杆机构中最短杆与最常杆长度之和（ ）其他两杆长度之和。
The home address was incomplete, so the letter could not be _______________.
His father was finally ____________ after he was proven to be innocent(无辜的)，but he had already spent ten years in prison.
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