DireCtor影片制作更复杂,具交互性的动画制作要使用DireCtor提供的行为和()。
A.动作库
B.行为库
C.项目库
D.素材库
参考答案:B
Li Lei didn't come to school today. What _______ to him? [ ]
A. was happened
B. happened
C. is happened
D. happening
有甲、乙、丙3瓶等体积、等物质的量浓度的硫酸。若将甲用水稀释,在乙中加入少量的BaCl2溶液,丙保持原状,然后用等浓度的NaOH溶液滴定,至恰好完全反应时,所需NaOH溶液的体积关系是( )
A.丙甲乙
B.丙=甲乙
C.乙丙甲
D.甲=乙=丙