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【简答题】
一滚子对心移动从动件凸轮机构，凸轮为一偏心轮，其半径R=30mm，偏心距e=15mm，滚子半径r k =10mm，凸轮顺时针转动，角速度 为常数。 试求：⑴画出凸轮机构的运动简图。⑵作出凸轮的理论廓线、基圆以及从动件位移曲线 图。
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【单选题】You ______these parcels yourself. The shop would have delivered them if you had asked them. [ ]
A.
needn't have carried
B.
mustn't have carried
C.
should have carried
D.
could have carried
【单选题】We usually have six lessons a day, and each of them ____ 40 minutes. [ ]
A.
last
B.
lasts
C.
have
D.
need
【简答题】身体评估的基本的检查方法包括 、 、 、 、 。
【单选题】We can see lots of small islands _________ the shore.
A.
on
B.
off
C.
along
D.
beside
【单选题】In the case of _______ teacher should keep a small pad beside them and make a note of one or two important mistakes.
A.
fluency practices
B.
accuracy practices
C.
proficiency practices
D.
efficiency practices
【单选题】Beside them , we need __ to do the work.
A.
fifteen people more
B.
more fifteen people
C.
fifteen more people
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