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【简答题】
消化液中的蛋白酶原需要激活后作用,胃蛋白酶原的激活物是____,胰蛋白酶原的激活物是____,而蛋白酶原的激活物是____。
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【简答题】A．witty B．powerful C．wealthy D．competitive
【单选题】Which of the following best explains why monopolistically competitive firms face a downward sloping demand curve while perfectly competitive firms do not?
A.
Monopolistically competitive firms sell a differentiated good.
B.
Monopolistically competitive industries have only a few firms.
C.
Monopolistically competitive firms have barriers to entry.
D.
Only industries with free entry and exit have firms that face horizontal demand curves.
【简答题】This offer is competitive and based on an expanding market.
【简答题】竞争性(competitive)
【简答题】Sports are by nature competitive. But recently, the over-competitive nature youth sports seem to have taken on has led to cause for ____. Those who are strongly against competition point out that in a...