论述城市法的基本特点及影响。

如图所示，光滑绝缘杆竖直放置，它与以正点电荷Q为圆心的某一圆周交于B、C两点，质量为m，带电量为-q的有孔小球从杆上A点无初速下滑，已知q＜＜Q，AB=h，BC=2h，小球滑到B点时速度大小为

3gh

，则小球从A运动到B的过程中，电场力做的功为______；小球在C点的速度为______．

AMERICANA HOTEL CRYSTAL CITY

Convenient location 5 minutes from Washington ,D.C. and one block to Crystal City Subway, Crystal City Underground. Alexandria. Free Parking, free Deluxe Continental breakfast and complimentary（收费的）Hotel Shuttle Service to Ronald Reagan Washington National Airport.

14000 Jefferson Davis Hwy(endurance on S. Eads St.)

Phone (703) 979-3722

DAYS INN ARLINGTON

Days Inn Arlington is located two miles from the Pentagon ,Lincoln Memorial .There is a restaurant which serves American style food ,plus two meeting rooms and an outdoor pool. Complimentary shuttle service runs to the Rosslyn Metro Station. Complimentary parking is available on the property .An experienced staff welcomes our guests.

Phone（703）525-0300

THE HIGHLANDER MOTORINN

Comfortable rooms at moderate(中等的) rates .Convenient location only minutes away from Washington area attraction. Near VA Square METRO Station and Ballston Commons Shopping Mall .Free continental breakfast ,free parking.

Phone(703)524-4300

HYATT REGENCY CRYSTAL CITY

Conveniently located next to Washington National Airport and two miles from Washington D.C. Complimentary Shuttle to and from National Airport ,metro ,local restaurants and shopping .Experience a view to remember at our rooftop restaurants “Chesapeake Grill.” Call for Reservations.

Phone(073)418-12341(800)233-1234

60．Which hotel does not provide service to drive its guests to the airport or metro stations?

A．Americana Hotel Crystal City B．Days Inn Arlington

C．The Highlander Motor Inn      D．Hyatt Regency Crystal City

61．If you want to stay in a hotel which provides free parking and free breakfast ,which telephone numbers will you ring to ask for further information?

A．(703)979-3722 or (703)524-4300   B．(703)524-4300 or (073) 418-12341

C．(073)418-12341 or (703) 525-0300       D．(703)525-0300 or (703)979-3722

62．Which hotel is close to airports?

A．Americana Hotel Crystal City B．Days Inn Arlington

C．Hyatt Regency Crystal City     D．The Highlander Motor Inn

63．Steven loves the idea of having delicious meal while enjoying the night view of Washington D. C. He will probably reserve a room by calling        .

A．(703)524-4300 B．(073)418-12341      C .(703)525-0300   D．(703)979-3722

大多数现代风险管理形式是从( )中发展而来的。

A．损失规避过程 B．损失控制行为 C．风险预防活动 D．购买保险实践

上头

“生产成本”账户期末若有借方余额，表示企业月末有在产品。 ( )