Shenzhou X and three astronauts(宇航员) were sent up from Jiuquan Satellite Launch Center, Gansu province, into a clear blue sky on Tuesday, bringing the nation one step closer to building its own space(太空) station in 2020.
　　Two men, mission commander(指挥官) Nie Haisheng and Zhang Xiaoguang, and China’s second female astronaut, Wang Yaping, are expected to stay in space for 15 days.
　　They will teach young people about science and do two space dockings, between Shenzhou X and the unmanned Tiangong-1 space module, a technically difficult procedure that brings two spaceship together in high-speed orbit(轨道).
　　The trip is our country's fifth manned space mission, 10 years after the country’s first astronaut, Yang Liwei, went into space in 2003.

由两条肽链构成的蛋白质分子，共有51个氨基酸，其失去水分子数及形成肽键数目分别是（  ）

已知函数 $f\left(x\right)=\{\begin{array}{c}{2}^x-2,x\ge 0\\ {\log }_{\frac{1}{2}}\left(-x\right),x<0\end{array}$ ，若ff（m）＜0，则实数m的取值范围为（   ）

阅读对话，判断句子正误。

如图为水位报警装置原理图，其中A、B为两个金属杆．当水位达到或超过警戒线时，绿灯、红灯和电铃的工作状态分别是____ ____ ____