A
B
C
D
第1题:
第2题:
第3题:
铰链四杆机构ABCD,如果以BC为机架(静件),当机构为双曲柄机构时,各杆的长度可为()。
第4题:
________
[A] similar to
[B] such as
[C] along with
[D] aside from