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【简答题】
若(f i (x)，f j (x))=1(i，j=1，2，3，i≠j)，则(f 1 (x)，f 2 (x)，f 3 (x))=1． 若(f 1 (x)，f 2 (x)，f 3 (x))=1，则(f i (x)，f j (x))=1(i，j=1，2，3，i≠j)?
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举一反三
【单选题】What is the advantage of TAF toothpaste compared with Flitz product?
A.
TAF toothpaste is cheaper.
B.
TAF toothpaste whitens his teeth.
C.
TAF toothpaste has a nice packaging.
【单选题】What is the advantage of TAF toothpaste compared with Flitz product?
A.
TAF toothpaste is cheaper.
B.
TAF toothpaste has a nice packaging.
C.
TAF toothpaste whitens his teeth.
【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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