多项选择题

数字音乐分为（）两类。

A.原声类
B.铃声、彩铃类
C.歌曲类
D.奏乐类

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单项选择题

To write a literature review, what should you write about after discussing the limitations of the previous works?
A、The way my work intend to fill this gap.
B、The gap revealed by these limitations.
C、The seminal works on this topic.
D、The achievements of the recent works.

单项选择题

24.对动物进行直肠检查时，脾脏位置明显后移，特征性标志是 A.
急性胃炎 B.
急性肠炎 C.
急性胃扩张 D.
肝炎 . E.
肾炎