2003年12月23日重庆市发生高压天然气井喷，造成了重大灾害．据分析该天然气中

某粮店出售的某种品牌的面粉袋上，标有质量为（25±0.2）的字样，从中任意拿出两袋，它们的质量最多相差______kg．

用所给词的正确形式填空。(10分)

小题1:Would you like something ____________ (eat)?

小题2:September 10^th is ___________ (teach) Day.

小题3:Are there any _________ (library) in your school?

小题4:Nick usually has dinner at 7:00 and ________ (watch) TV at 8:00.

小题5:I live on the _________ (one) floor in the building.

小题6:How ________ (love) the birds on the trees are!

小题7:Kobe can play basketball very         (good).

小题8:Daniel’s parents are good basketball           (play).

小题9:My mother enjoys ________ (walk) down the street in the morning.

小题10:Here are three          (photo) on the wall. They are very beautiful.

生产可能性曲线

在紫外吸收光谱法中，极性溶剂有助于n→π*跃迁产生的吸收带向（）。

A.长波移动

B.短波移动

C.A、B都可以

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