在直角坐标系中，画出下列向量：（1）|a|=2，a的方向与x轴正方向的夹角为60

     文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

     增加:在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

     删除:把多余的词用斜线(\)划掉。

     修改:在错的词下划一横线,并在其下面写出修改后的词。

     注意：1.每处错误及其修改均仅限一词；

                2.只允许修改10处,多者(从第11处起)不计分。

     Last week I went to a movie. It was very touched. It was a sad movie about a mother and

his son. When the child was a little boy, his mother was very poor that she had to send him to

a rich family who had no child. The boy accepted a very good education and twenty years late

became a doctor. In his hospital, he had a patient, who was an old lady. He did care too much

about her, for she could hardly afford for the medical care. One evening, the lady died quietly

of serious disease and on her bed the doctor found a letter, from it he discovered the truth and

felt the love of a great mother. He wanted to call her mother, but it was too late. Nobody in the

theatre was moved to tears.      

________________________________________________________________________

下列事件中，是必然事件的是（　　）

A．打开电视机，正在播放新闻

B．父亲年龄比儿子年龄大

C．通过长期努力学习，你会成为数学家

D．下雨天，每个人都打着雨伞

将预算划分为投入预算和产出预算的标准是( )。

A．按预算的编制方法

B．按预算编制的形式

C．按预算项目能否直接反映其经济效果划分

D．按预算收支的平衡状态

如图甲所示，在光滑绝缘的水平面上，放有一个粗细均匀的单匝正方形线圈abcd。在外力的作用下从静止开始向右运动，穿过固定不动的、有理想边界的匀强磁场区，磁感应强度的大小为B，磁场区的宽度大于线圈的边长。若测得线圈中产生的感应电动势E的大小和运动时间t的变化关系如图乙所示。已知图象中的三段时间分别为△t₁，△t₂和△t₃，且在△t₂时间内外力为恒力。

(1)定性说明线圈在穿过磁场的过程中做何种运动？

(2)若测得线圈的bc边刚进入磁场时的速度为v，bc两点间电压为U，求线圈在△t₁时间内的平均感应电动势；

(3)若测得△t₁：△t₂：△t₃=2：2：1，求线圈的边长与磁场区的宽度比值为多少？

(4)若仅给线圈一个水平的初速度v₀，使线圈自由的向右滑入磁场，试画出从线圈bc边刚进入磁场开始计时，其后可能出现的v-t图象。（提醒：自己建立坐标系，只需定性画出速度的变化情况，除了初速度v₀以外，不需要标出关键点的坐标）

下列属于旅游包餐的是（）

A、文艺团体集体用餐

B、交易会

C、洽谈会

D、观光团考察团