题目内容

2.Woo Sung comes from , Korea and isyears old.

A. Seoul, 20
B. Pusan, 20
C. Seoul, 21
D. Pusan, 21

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3.Natalie is years old and lives in.

A. 24,Brazil
B. 24,theUnited States
C. 25,Brazil
D. 25,the United States

4. Dayanneisfrom.

A. Brazil
B. Mexico

5. Dan is from and isyears old.

A. theUnited States, 27
B. theUnited States, 28
C. the United Kingdom, 27
D. the United Kingdom, 28

产生PWM波的方法有

A. 计算法
B. 调制法
C. 跟踪控制方法
D. 随机法