分解因式（20分）： （1）x(x-y)-y(y-x) （2） 7x2－63 （

导游人员的良好素质是德、智、体、美的全面发展和统一，其标准是成为（）的社会主义旅游业的合格工作者。

A.有理想

B.有抱负

C.有文化

D.有纪律

E.有道德

电子自静止开始经M､ N板间(两板间的电压为U)的电场加速后从A点垂直于磁场边界射入宽度为d的匀强磁场中,电子离开磁场时的位置P偏离入射方向的距离为L,如图所示.求:

(1)正确画出电子由静止开始直至离开匀强磁场时的轨迹图;(用尺和圆规规范作图)

(2)匀强磁场的磁感应强度B.(已知电子的质量为m,电荷量为e)

词汇运用 用所给词的适当形式填空，每空不限一词。（共10小题；每小题1分，满分10分）

1. This dress is very popular this year. Do you know who the ________(design) is?

2. English Classroom is an _______(education) program on CCTV.

3. We have got a new printer, it_________(print) quickly.

4. If you answer all the questions _________ (correct), you will win.

5. I couldn’t stop _________(clap) when I heard the good news.

6. —How many times ________ you ________（phone） me these days? —Three times.

7. Where is Jim? He ________(do) his homework in the study at present.

8. We will hold a party to celebrate her ________ (twenty) birthday.

9. The boy fell off the tree and ___________(hurt) badly.

10. When the parade marched along the park, the children screamed with _______(excite)

工程师在接到延期开工申请后（）以书面形式答复承包人。

A．两周内

B．两周后

C．24小时内

D．48小时内

侵权注册商标专用权行为的主要表现有哪些