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【单选题】
不符合分子式C 4 H 8 的物质是（）A.
丁烷
B.
丁烯
C.
环丁烷
D.
2－甲基丙烯
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举一反三
【单选题】钩舌推铁的主要故障时变形和磨耗。一般较少发生裂纹，变形的原因是本身刚度不足，发生磨耗或变形后，车钩便失去（）。
A.
闭锁作用
B.
开锁作用
C.
全开作用
D.
连接作用
【简答题】车钩的三态作用是利用车钩提杆把 提起或落下,通过 与钩铁的作用,使车钩处于闭锁、开锁和全开状态。
【单选题】Hastings's response to Markham's argument that the history of the American government 'shows that it [the Electoral College] is doing something right' would most likely be which of the following?
A.
Under the current system, each voter in Alaska has proportionately three times as much voting power as each candidate in Florida.
B.
We do not know whether or not the American government would have been equally stable had the president been elected by a direct popular election since the beginning.
C.
If the candidate who lost the popular election won the presidency four times in 200 years, there is something wrong with the system.
D.
Maintaining a strong federal system is less important than upholding the principle that each vote should count equally.
E.
A process that maintained the Electoral College but removed the winner-take-all system would substantially reduce the disenfranchisement that occurs under the current system.
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