【单选题】关于分布式数据库系统和并行数据库系统,下列说法正确的是______。 A)分布式数据库系统的目标是利用多处理机结点并行地完成数据库任务以提高数据库系统的整体性能 B)并行数据库系统的目的主要在于实现场地自治和数据全局透明共享 C)并行数据库系统经常采用负载平衡方法提高数据库系统的业务吞吐率 D)分布式数据库系统中,不存在全局应用和局部应用的概念,各结点完全不独立,各个结点需要协同工作
【简答题】人体恶性肿瘤的自然生长史依次分为以下 4 个阶段: ______ 、 ______、______、______。
【单选题】The girl is eating the ( ).
【单选题】The girl was ______ ice cream in the sofa while the boy was ______ paper at the table. [ ]
【单选题】The girl _______ ice cream in the sofa while the boy ________ paper at the table, [ ]
A.
was eating; was cutting
【单选题】_____ isn’t a good eating habits.
【单选题】Gloria is the girl ____ is eating an apple now.
【单选题】羟基香豆素类化合物在紫外线下显何种颜色的荧光
【单选题】听力原文:(A) The two kids are eating lollipop. (B) The woman is combing the girl's hair. (C) The children wear identical sweaters. (D) They are lying on the sand ground.