单项选择题
“天苍苍,野茫茫,风吹草低现牛羊”形容的是()之美。
A.奇
B.险
C.雄
D.旷
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单项选择题
—()—It’s not bad.I have worked in this bank for two years and I love my current job.
A.Could you do me a favor?
B.How is everything going?
C.What’s going on?
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单项选择题
已知四杆机构AD为机架,AB=a=50,BC=b=140,CD=c=100,AD=d=160,则该机构属于()机构,该机构出现死点的条件是滑块为原动件且曲柄与连杆共线的两个位置。
A.曲柄摇杆
B.双曲柄
C.双摇杆
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