【单选题】在表面粗糙度的测量方法中,属于接触测量的是( )。
【简答题】2011年江苏部分地区遭遇百年大旱,随着干旱时间持续,作物叶片开始发黄,光合速率下降,植株生长缓慢,甚至死亡。某研究性学习小组采用盆栽幼苗的方式,探究土壤干旱对叶片光合速率的影响原因。实验开始时土壤水分充足,然后A组停止浇水,B组土壤水分条件保持适宜,根据实验测得的数据,绘制坐标曲线如下。请回答有关问题: (1)在干旱的环境中,农作物的根系不能从土壤中吸水,这是由于___________。 (2)...
【判断题】毛泽东在《论反对日本帝国主义的策略》报告中,阐明了党的抗日民族统一战线的新政策。
【单选题】What is Rutan’s biggest achievement according to the video?
A.
He ended the government’s monopoly on space travel.
B.
He founded Virgin Galactic the world’s first spaceliner.
C.
He won a lot of trophies by making model planes.
D.
He successfully attracted investment from the richest man to the space industry.
【判断题】在表面粗糙度的测量方法中,光切法属于非接触测量法。( )
【单选题】毛泽东在( )中阐明了党的抗日民族统一战线新政策。
【简答题】What ’ s Rutan ’ s next vision?
【单选题】What ’ s one engineering breakthrough mentioned about Rutan ’ s spaceship?
A.
It ’ s very light-weight.
B.
It ’ s custom-made from scratch by a very small company.
C.
Feathers are glued to the spaceship to enable safe reentry.
D.
It can reposition itself like a shuttlecock in flight.
【简答题】What ’ s the deal between Branson and Rutan?
【单选题】What's one engineering breakthrough mentioned about Rutan's spaceship?
A.
It's very light-weight.
B.
It's custom-made from scratch by a very small company.
C.
Feathers are glued to the spaceship to enable safe reentry.
D.
It can reposition itself like a shuttlerock in flight.