搜索
 | Wang Yaping is an astronaut in China. She was sent to space twice. She gave lectures about space during the missions（太空任务）, encouraging millions of school children across China. |
 | Zhang Guimei is a teacher in Huaping County, Yunnan province（云南省华坪县）. Many girls there couldn’t go to school because they were very poor. Ms.Zhang started a girl school for free and helped over 1, 800 girls go to college. |
1．How many times was Wang Yaping sent to space?
| A．Twice. | B．Three times. | C．Four times. |
| A．Wang Yaping. | B．Zhang Guimei. | C．Tu Youyou. |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
