问题
多项选择题
电磁污染环境产生电磁干扰使( )性能下降、工作不正常或发生故障。
A．电子控制装置
B．科研所
C．过程测量装置
D．电气设备
答案
参考答案：A,C,D
解析： 电磁污染源及对环境的影响
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电磁污染环境产生电磁干扰使( )性能下降、工作不正常或发生故障。
A．电子控制装置
B．科研所
C．过程测量装置
D．电气设备
参考答案：A,C,D
解析： 电磁污染源及对环境的影响
| Artificial flowers are used for scientific as Well as for decorative purposes. They are made from (51) of materials, such as wax and glass, so skillfully that they can scarcely be (52) from natural flowers. In making such models, painstaking skill and artistry are called for, (53) thorough knowledge of plant structure. The (54) of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known (55) the scientific world. (56) , there are several thousand models in colored glass, the work of two artist naturalists, Leopold Blalschka and his son Rudolph. The intention was to have the collection (57) at least one member of each flower family native to the United States. (58) it was never completed, it contains more than seven hundred species representing 164 families of flowering plants. (59) detail of these is accurately reproduced in color and structure. The models are (60) n locked cases as they are too valuable and fragile for classroom use. |
A．Because
B．However
C．Nevertheless
D．Although