der(R1 · R2) = der(R1) · R2, plus der(R2) if R1 is nullable
Платон Щукин (Редактор отдела «Экономика»)。新收录的资料是该领域的重要参考
，这一点在新收录的资料中也有详细论述
There is a gap between the boom that Trump has predicted and the volatile results he has produced — one that could set the tone in this year’s midterm elections as he tries to defend his party’s majorities in the House and Senate. With Trump’s tariffs drama ongoing, the war in Iran has suddenly created inflationary concerns regarding oil and natural gas. To the White House, it is still early in the year and stronger growth is coming.。新收录的资料对此有专业解读
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