according to passage i of this unit, the ilie :-@ means ____________.
在牛顿的三棱镜分光实验中,哪种颜色的光偏折角度最大?
在基点基面实验中,不同孔径的平行光线入射到双凸柱透镜上,孔径高度不同的光线在光轴上是否交于一点?
tell your teacher ________ is your study difficulty, so that he could give you some advice.
yiwu is crowned as the city with the world’s largest commodity _______ market.
it was not until 1911 ______ the first of the vitamins was identified.
在搭建开普勒望远镜的实验中,以下说确的是:
complete each of the following statements according to the passage. showing up with an uninvited friend could turn out to be an _______ situation for everyone.
the speaker is going to work in another______.
the new drug will not be put on the market ____ it has proved safe on humans.
the author was sure that the hotel survey he suggested was simpler for customers to complete.
the traditional stores have found it difficult to _____with online shops recently.
植物细胞破碎一般常用的方法是以下哪一种?
employees are not allowed (make) ________ personal phone calls in the office.