___________, who is a major general, military pilot, and China National Space Administration astronaut, became the first person sent into space by the Chinese space program in October 2003.
A. Zhai Zhigang
B. Nie Haisheng
C. Yang Liwei
D. Jing Haipeng
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__________ is a Chinese pilot and astronaut who served as a crew member on the space mission Shenzhou 9. On June 16, 2012, she became the first Chinese woman in space.
A. Wang Yaping
B. Liu Yang
C. Valentina Tereshkova
D. Wu Minxia
电子计数器的基本组成有：输入通道、计数与显示电路、时基产生电路、控制电路。
A. 对
B. 错
输入通道是对输入信号进行放大、整形等，只有A、B两个通道。
A. 对
B. 错
计数电路是通用计数器的核心电路，完成脉冲计数。
A. 对
B. 错
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