皮皮学，免费搜题
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【单选题】
SH6型转换锁闭器主要由转换锁闭机构和( )等组成A.
手动安全机构
B.
挤脱表示机构
C.
表示锁闭机构
D.
动力机构
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is true about producer surplus?
A.
Producer surplus is how much more it costs sellers than they are paid.
B.
Producer surplus is shown graphically as the area under the demand curve but above the supply curve.
C.
An increase in the market price due to an increase in demand will increase producer surplus.
D.
All of the above are true about producer surplus.
【单选题】Total surplus with a tax is equal to
A.
consumer surplus plus producer surplus.
B.
consumer surplus minus producer surplus.
C.
consumer surplus plus producer surplus minus tax revenue.
D.
consumer surplus plus producer surplus plus tax revenue.
【简答题】人的生理成熟以具有（ ）能力为标志。
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