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【单选题】
在铣床上使用各种不同的铣刀可以加工 、 、 、 和切断材料等。若配合分度装置的使用,还可加工 、 、 和 等。A.
回转体外圆面 台阶 沟槽 特形面 需圆周等分的花键 齿轮 牙嵌式离合器 螺旋槽
B.
平面 台阶 沟槽 特形面 需圆周等分的花键 齿轮 牙嵌式离合器 螺旋槽
C.
平面 台阶 沟槽 需圆周等分的花键 齿轮 牙嵌式离合器 螺旋槽
D.
平面 台阶 沟槽 特形面 需圆周等分的花键 齿轮 牙嵌式离合器 方孔
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【单选题】Because we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. If you could take a one pound packet of butter 4,000 miles out f...
A.
The Earth Weight
B.
Weight in Space
C.
Changing Weight on the Earth
D.
Weight on and off the Earth
【单选题】We always ______ other people for doing great things; however, we ignore that we can succeed by ourselves.
A.
celebrate
B.
imagine
C.
admire
D.
congratulate
【单选题】We can make our life happier if we __.
A.
get rid of useless things
B.
buy more things
C.
sell things we do not need
D.
give up more
【单选题】Were it not for television, we ______ things that are happening in other places.
A.
can not see
B.
will not see
C.
could not see
D.
did not see
【简答题】DBecause we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. If you could take a one-pound packet of butter 4, 000 miles out...
【简答题】世界上现存最早的敞肩石拱桥是（ ）。
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