如图,显微镜下观察到的物像在视野右下方,要把物像调到视野中央,应将玻片标本向( )移动.
A:右上方
B:左下方
C:左上方
D:右下方
These fans arrived very early. They could see their favorite stars. (合并成一个句子)
These fans arrived very early ____ they could see their favorite stars.
选择填空
is are am
某化合物完全燃烧,需要O24.8g,同时只生成CO24.4g和水2.7g,则该化合物中( )