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【单选题】
在平面机构中,每个低副引入两个约束,使构件失去( )个自由度。A.
1
B.
2
C.
3
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【单选题】The traditional Navaho does not allow copying of sandpaintings because ______.
A.
it is against Navaho belief system
B.
this is a craft exclusive to the supernatural
C.
anything copied is considered worthless
D.
the copying may bring harm to other Navahos
【简答题】My favorite film, Casablanca ,______was made in 1942, will be shown in the cinema again next week. [A]it [B]as [C]that [D]which
【单选题】What are you ______doing at the weekend ?
A.
looking for
B.
looking at
C.
looking forward to
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