Application of derivative: This paper is divided into two parts: Volume I and Volume II. Please fill in the answers to the multiple-choice questions in the brackets after the questions. Volume two can be answered directly after each question. *** 100, and the examination time is 90 minutes. The first volume (multiple choice questions ***30 points) 1. Multiple choice questions (this big question * * 65438+. 0, the following relationship must be true: a.f (0)