风动机部分由带有活动叶片的转子和壳体组成，当输入0.3～0.5MPa的压缩空气时，驱使转子高速旋转，转速可达8000r/min，从而带动齿轮转盘高速旋转。( )
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快速短效类洋地黄制剂是
A. 毛花甙丙
B. 地高辛
C. 洋地黄毒甙
D. 多巴胺
E. 多巴酚丁胺
Questions 17—20 are based on the following conversation. Why are scientists now studying variations in body temperature
A. To get a better understanding of illness.
B. To discover the side effects of thermography.
C. To find out why a body requires rest.
D. To improve the analysis of blood and tissue samples.
低压带电作业应穿绝缘鞋和全棉长袖工作服，并戴手套、安全帽和护目镜，站在干燥的地面上进行。
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