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【简答题】
Questions 9 to 11 are based on the conversation you have just heard. 9. A) Get a ride home with Nancy. B) Find a place to live. C) Go to the store before it closes. D) Carry his groceries home. 10. A) He didn't expect to buy a lot. B) He had only one bag of groceries. C) The supermarket is just down the block. D) He thought he'd get a ride with the Smiths. 11. A) They are paying for his education. B) They invited him to their party. C) They took him on a vacation with them. D) They let him live with them for free.
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【简答题】为什么说从现在到2020年是全面建成小康社会的决胜期?
【单选题】蜗杆传动中,已知蜗杆轴上扭矩为T1,蜗杆分度圆直径d1,蜗轮轴上扭矩T2,蜗轮分度圆直径d2,压力α,则作用在蜗杆上的轴向力Ft2为 。
A.
2T1∕d2
B.
2T1∕d1
C.
Ft2
D.
2T2∕d2
E.
2T2∕d1
【单选题】蜗杆传动中,已知蜗杆轴上扭矩为T1,蜗杆分度圆直径d1,蜗轮轴上扭矩T2,蜗轮分度圆直径d2,压力α,则作用在蜗杆上的轴向力Fɑ2为 。
A.
2T1∕d1
B.
2T2∕d2
C.
2T1∕d2
D.
2T2∕d1
E.
Ft2
【简答题】如何理解马克思所说的“金银天然不是货币,但货币天然是金银”?
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