食用菌菌种生产经营许可实施程序
百度 那为什么只有电离层能产生大量的自由电子和离子呢？原来在很高的高度上，太阳辐射虽强，但空气密度很小，可供电离的成分有限，所以电子密度不会很大；在较低高度处，空气密度大，可供电离的中性成分很多，但太阳辐射透过厚厚的大气时变得愈来愈弱，而且复合过程变强，因此，这里的电子密度也不会很大。
Technical Committees of...
National Standardization Technical Committees and the bodies in charge of all kinds of standards are technical organizations developing standardization work, the committees are developing technical services within corresponding professional scope in membership form.
| No. | Name of National Standardization Technical Committees | Applicable International Standard TC |
|---|---|---|
| 01 | ISO Thread of Standardization Administration of China | ISO/TC1 |
| 02 | Mechanical Engineering Documents Branch of ISO Technical Product Documentation of Standardization Administration of China (TC10) | ISO/TC10/SC6 |
| 03 | ISO Pulleys and Belts (including v-belts) of Standardization Administration of China | ISOATC41 |
| 04 | National Technical Committee on Thread of Standardization Administration of China | ISO/TC1and ISO/TC5/SC5 |
| 05 | Technical Committee on Fasteners of Standardization Administration of China | ISO/TC2 |
| 06 | National Technical Committee on Pipe Fitting of Standardization Administration of China | ISO/TC5/SC5/SC10 |
| 07 | National Technical Committee on Technical Product Documentation of Standardization Administration of China | ISO/TC10/SC6 |
| 08 | "National Technical Committee on Shafts for Machinery and Accessories of Standardization Administration of China | ISO/TC14 |
| 09 | National Technical Committee on Particle Characterization Including Sieving of Standardization Administration of China | ISO/TC24 |
| 10 | National Technical Committee on Plain Bearings of Standardization Administration of China | ISOHC123 |
| 11 | National Technical Committee on Machinery Safety of Standardization Administration of China | ISO/TC199 |
| 12 | National Technical Committee on Product Dimension and Geometric Element Specifications of Standardization Administration of China | isorrc2i3 |
| 13 | National Technical Committee on Spring of Standardization Administration of China | ISO/TC227 |
| 14 | National Technical Committee on Electro-technical Terminology of Standardization Administration of China | IECVTC1 |
| 15 | Technical Committee on Preparation of Electric Information Structural Documents and Graphic Symbol of Standardization Administration of China | IECTTC3 |
| 16 | National Technical Committee on Voltages, Current Ratings and Frequencies of Standardization Administration of China | IEC/TC3 |
| 17 | National Technical Committee on Pulleys and Belts (including v-belts) of Standardization Administration of China | ISO/TC41 |
| 18 | National Technical Committee on Micro Mechanical and Electrical Technology of Standardization Administration of China | IEC/TC47F |
| 19 | National Technical Committee on Welding of Standardization Administration of China | IEC/TC44 |
| 20 | National Technical Committee on Casting of Standardization Administration of China | ISO/TC25 ISO/TC17/SC11 |
| 21 | National Technical Committee on Gear of Standardization Administration of China | ISO/TC60 |
| 22 | National Technical Committee on Mechanical Vibrations, Impacts and State Monitoring of Standardization Administration of China | ISO/TC108 |
| 23 | National Technical Committee on Metallic and Non-metallic Coating of Standardization Administration of China | ISOHC107 |
| 24 | National Technical Committee on Hydropneumatic of Standardization Administration of China | ISO/TC131 |
| 25 | National Technical Committee on Automation Systems and Integration of Standardization Administration of China | ISOHC184 |
Subsidiary
Harbin Welding Research Institute Co., Ltd.
Zhengzhou Machinery Research Institute Co., Ltd.
Zhongji First Design and Research Institute Co., Ltd.
Wuhan Material Protection Research Institute Co., Ltd.
Beijing Machinery Industry Automation Research Institute Co., Ltd.
Beijing Institute of Mechanical and Electrical Research Co., Ltd.
Machinery Development Technology Co., Ltd.
China Machinery Productivity Promotion Center
Zhongji Huanyu Certification and Inspection Co., Ltd.
Beijing Machinery Science Guochuang Lightweight Research Institute Co., Ltd.
Yunnan Institute of Mechanical Research and Design
Jiangsu Branch of General Academy of Mechanical Science Research Co., Ltd.
Haixi (Fujian) Branch Co., Ltd., General Academy of Mechanical Sciences
Qingdao Branch of General Academy of Mechanical Science Research Co., Ltd.
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