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举一反三
【单选题】铁路扳道工因和恋人分手饮酒致醉,未能按时扳道,致使两列火车相撞,构成犯罪,其义务来源于( )
A.
法律规定的义务
B.
由于法律行为而产生的义务
C.
由于先行行为而产生的义务
D.
职务或者业务上要求履行的义务
【简答题】toothpaste
【单选题】Toothpaste is a substance【C1】______for the cleaning and polishing the surface of the teeth. Its primary function is【C2】______tooth decay. It is only as a by-product of cleaning teeth【C3】______toothpas...
A.
use
B.
used
C.
using
D.
uses
【单选题】If toothpaste manufacturers compete in a monopolistically competitive market, then:
A.
firms are price takers.
B.
firms try to differentiate their products from those of competitors.
C.
firms maximize profits by choosing output where price equals marginal cost.
D.
there are significant barriers to entering the toothpaste industry.
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