保护切断时间取决于系统接地形式，不论接触电压多少，切断时间应不超过( )。 A．5 发布时间：2017-05-10 04:47 │ 来源：www.tikuol.com 题型：多项选择题 问题： 保护切断时间取决于系统接地形式，不论接触电压多少，切断时间应不超过( )。A．5s B．1s C．0.5s D．0.4s
题型：多项选择题 完形填空。 Foulsham House is a fine, large house of the 1790s. It __1__ by the River Byre, in twenty-five hectares of the best farmland in the southwest. The house __2__ by Smithson, and the story goes __3__ to George, the son of the King of Whales, who __4__ love with the beautiful lady Kitty, at one of the first Foulsham's wild woods parties. Many years ago many great men __5__ on the hills about Foulsham House, and many fine girls took tea in the Green Room. The house has eight bedrooms,three bathrooms, two living-rooms, and a dining-room __6__ a real dam fireplace. Its library has a good __7__ over the park and the river. __8__ rooms are light and airy,with good, high windows, and wood floors. At the back of the house there is __9__ for four cars. The third Foulsham once kept horses there. In many other ways, this house of the 1790s meets the __10__ 0f the 1990s. If you wish to know more about Foulsham House, write to: Harvey. Platt, Longford & Sons 6, Castle Green, Giliam, Byreside.( )1. A. stands ( )2. A. put up ( )3. A. back ( )4. A. fell off ( )5. A. jumped ( )6. A. there is ( )7. A. view ( )8. A. Few ( )9. A. somewhere ( )10. A. sizes B. sits B. built B. Away B. fell down B. Rode B. Has B. Photo B. Some B. Room B. Colors C. relaxes C. were put upC. close C. fell in C. drove C. with C. sound C. Many C. places C. styles D. sleeps D. was built D. next D. fell onto D. flew D. and D. music D. All D. spaces D. needs 查看答案
题型：多项选择题 综合光学、流体力学、电子计算机技术，利用荧光素产生荧光的特点，对单个细胞进行多参数定量测定和分选的技术称为（）A.荧光免疫分析B.酶联免疫分析C.流式细胞免疫分析D.化学发光免疫分析E.放射免疫分析 查看答案