钟嵘指出,在诗歌创作中,()应居主要地位。
参考答案:五言诗
Steve was busy clearing the cups and dishes from the table ________ others were playing.
A.until
B.if
C.since
D.while
决策支持系统主要支持以下哪类决策问题
A.定性决策与结构化决策
B.定量决策与半结构化决策
C.半结构化与非结构化决策
D.结构化与半结构化决策