"We will set new standards, expand our cooperation with Russia, and pursue new partnerships to lock down these sensitive materials."

VOA: standard.2010.04.06

We're going to differentiate with respect to q1, the thing we're trying--our control variable, the thing we're trying to maximize the thing with respect to and set it equal to 0.

对q1求导,q1是控制变量,也就是我们想要求出的最大值,令它等于0

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