The movie is ___________ moving ___________ we all cry.
A:too; to
B:so; that
C:enough; to
D:such; that
国家统一是历史发展的主旋律。请结合所学知识回答:
如图所示,在研究磁场对电流作用的实验装置中,导体棒ab不可能选用下列哪种材料制成( )