一个有效的激励约束通常包括那几个基本的约束条件（）A、激励相

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问题多项选择题

一个有效的激励约束通常包括那几个基本的约束条件（）

A、激励相容约束

B、激励参与约束

C、激励选择约束

D、刺激相容约束

E、刺激参与约束

F、刺激选择约束

答案

参考答案：B, D

选择题

—How much do you know about the 3D film technology?

—A little. Not until _______the hot movie Avatar _______ some about it.

A．did I see; did I begin to learn

B．I saw; I began to learn

C．I saw; did I begin to learn

D．did I see; I began to learn

选择题

Jack a great talker. It’s high time that he __ something instead of just talking.

A．will do

B．has done

C．do

D．did