搜题请搜索小程序“爱下问搜题”
问题 问答题

如图所示，A′O′是AO在平面镜中成的像．画出平面镜的位置来．

答案

平面镜所成的像和物体是以镜面为对称轴的轴对称图形，连接AA′，OO′，做这两条线段的垂直平分线即可．如图：

默写题

请根据提示填写相应的古诗文。

①“大爱无私，真情无悔”，李商隐在《无题》中用 “                         ，                      ”来向世人诠释了这一种高尚的品质，这种不朽的感情。

②白居易用“可怜身上衣正单，心忧炭贱愿天寒。”表现卖炭翁的矛盾心理，在《观刈麦》中诗人也用“____________________，____________________”来表现对劳动人民的同情。 ③《关雎》是一首优美的恋歌，开头两句“_________________，__________________”成功地运用了比兴手法，为下文抒发爱情创造了情意绵绵的意境。

④《渔家傲》中抒发壮志难酬的感慨和思乡忧国的情怀的诗句是“_________________，__________________。”

⑤站在江边，微风轻拂，江水浩淼，波平浪静一叶白帆悠然的飘荡在江面上，恰似王湾《次北固山下》中“________    ___   ______，__________      ______”的美景。
查看答案
单项选择题

The analysis phase answers the questions of who will use the system，what the system will do，and where and when it will be used．During this phase，the project team investigates any current system，identifies (71) ，and develops a concept for the new system．This phase has three steps：first， (72) is developed to guide the project team’s efforts．It usually includes an analysis of the current system and its problems，and the ways to design a new system．The next step is (73) ．The analysis of this information-in conjunction with input from the project sponsor and many other people-leads to the development of a concept for a new system．The system concept is then used as a basis to develop a set of business analysis models that describes how the business will operate if the new system were developed．The set of models typically includes models that represent the (74) necessary to suppor the underlying business process．Last，the analyses，system concepts，and models are combinedin to a document called the (75) ，which is presented to the project sponsor and other key decision makers that decide whether the project should continue to move forward．

A．a user manual
B．an analysis strategy
C．an analysis use case
D．a design user case
查看答案