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【单选题】
Let's go back to the city, __________?A.
will you
B.
shall we
C.
ok
D.
don't you
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【单选题】将材料为45钢的齿轮毛坯加工成6级精度的硬齿面直齿圆柱外齿轮，该齿轮制造工艺顺序应是___________为宜。
A.
滚齿、表面淬火、磨齿
B.
滚齿、磨齿、表面淬火
C.
表面淬火、滚齿、磨齿
D.
滚齿、调制、磨齿
【简答题】Reasons for changing careers are different in nature, but many people move because they are tired _______ their current jobs and just want a change.
【单选题】Can the scientist ______ [iks'plein] the reasons for changing the plan?
A.
explain
B.
experience
C.
explore
D.
expensive
【简答题】Reasons for changing careers are different in nature, but many people move because they _____their current jobs and just want a change.
【单选题】将材料为45钢的齿轮毛坯加工成为6级精度的硬齿面直齿圆柱外齿轮，该齿轮制造工艺顺序应是（ ）。
A.
滚齿、表面淬火、磨齿
B.
滚齿、磨齿、表面淬火
C.
表面淬火、滚齿、磨齿
D.
滚齿、调质、磨齿
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