发生触电事故的危险电压一般是从多少伏开始（）。 24。 26。 65。
简述生产过程控制的主要内容是什么？
使用电气设备时，由于维护不及时，当下列哪项进入时，可导致短路事故（）。 导电粉尘或纤。 强光辐射。 热气。
A Bridge for Squirrels
San Francisco has its cable cars. Seattle has its Space Needle. And， Longview has its squirrel bridge. The bridge， which has attracted international attention， is now a local landmark.
The Nutty Narrows Bridge was built in 1963 by a local builder， Amos Peters， to give squirrels a way to cross the busy road without getting flattened by passing cars.
The original bridge was built over Olympia Way on the west edge of the library grounds. Before the bridge was built， squirrels had to avoid traffic to and from the Park Plaza office building where office staff put out a nutty feast for the squirrels. Many times， Peters and others who worked in and near Park Plaza witnessed squirrels being run over.
One day Peters found a dead squirrel with a nut still in its mouth， and that day's coffee break discussion turned into squirrel safety. The group of businessmen cooked up the squirrel bridge idea and formed a committee to ask the blessing of the City Council （市政会）.The Council approved， and Councilwoman Bess LaRiviere jokingly named the bridge "Nutty Narrows".
After architects designed the bridge， Amos Peters and Bill Hutch started construction. They built the 60-foot bridge from aluminum and lengths of fire hose （消防水带）. It cost 1000.
It didn't take long before reports of squirrels using the bridge started. Squirrels were even seen guiding their young and teaching them the ropes. The story was picked up by the media， and Nutty Narrows became known in newspapers all over the world.
In 1983， after 20 years of use， Peters took down the worn-out bridge. Repairs were made and crosspieces were replaced. The faded sign was repainted and in July 1983， hundreds of animal lovers attended the completion ceremony of the new bridge.
Peters died in 1984 ，and a ten-foot wooden squirrel sculpture was placed near the bridge in memory of its builder and his devotion to the project.
The Nutty Narrows Bridge was built in order to（）. offer squirrels a place to eat nuts。 set up alocal landmark。 help improve traffic。 protect squirrel。
某企业2002年1月1日购买华为公司1999年1月1日发行的面值为1000元，票面利率4％，期限10年，每年年末付息一次的债券。若此时市场利率为5％。计算该债券（2002年1月1日时）的价值。
工厂内各固定电线插座损坏时，将会引起（）。
