## 题目

$$A. a > 1$$

$$B. a < -2$$

$$C. -2 < a < 1$$

$$D. a=1 或 a = -2$$

## 叙利亚上空的E-3哨兵预警机 U.S. Air Force photo by Tech. Sgt. Paul LabbeVIRIN: 180403-F-MQ799-800.JPGImage From: https://www.af.mil/News/Photos/igphoto/2002078714/ 继续阅读“叙利亚上空的E-3哨兵预警机”

## 美日多型战机参加大象漫步起飞 U.S. Air Force photo by Airman First Class China ShockVIRIN: 200622-F-SA178-9013.JPGImage From: https://www.af.mil/News/Photos/igphoto/2002322409/

## 题目

$$A. f_{1}(x) \leqslant f_{2}(x) \leqslant g(x)$$

$$B. f_{2}(x) \leqslant f_{1}(x) \leqslant g(x)$$

$$C. f_{1}(x) \leqslant g(x) \leqslant f_{2}(x)$$

$$D. f_{2}(x) \leqslant g(x) \leqslant f_{1}(x)$$

## 起飞前的B-2隐身轰炸机 U.S. Air Force photo by Senior Airman Thomas BarleyVIRIN: 190117-F-WU042-9026.JPGImage From: https://www.af.mil/News/Photos/igphoto/2002085217/

## 题目

$$A. 函数 f(x) 有 2 个极值点，曲线 y=f(x) 有 2 个拐点$$

$$B. 函数 f(x) 有 2 个极值点，曲线 y=f(x) 有 3 个拐点$$

$$C. 函数 f(x) 有 3 个极值点，曲线 y=f(x) 有 1 个拐点$$

$$D. 函数 f(x) 有 3 个极值点，曲线 y=f(x) 有 2 个拐点$$

## 准备起飞的B-52H轰炸机 U.S. Air Force photo by Senior Airman Alyssa DayVIRIN: 200602-F-VF865-9167.JPGImage From: https://www.af.mil/News/Photos/igphoto/2002322401/

## 题目

$$A. ① 收敛，② 收敛$$

$$B. ① 收敛，② 发散$$

$$C. ① 发散，② 收敛$$

$$D. ① 发散，② 发散$$
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