The high and low temperature test chamber is to detect the parameters and performance of the materials and products after the temperature environment changes during the high and low temperature tests. During the test, the humidity fluctuation and change are two important factors in the high and lo ......
8. In the hydrogen nuclear magnetic resonance spectrum of CH3-CH2-COOH, one group of quartet and triplet can be observed. (1) Explain the causes of these peaks; (2) Which group of peaks is in the lower field? Why / solution: (1) Due to the spin coupling phenomenon between a-, b-protons, according to ......
Material prices are opaque? Material quality is not guaranteed? The renovation cannot be completed on time? Furniture and building materials have passed the "three guarantees" service period frequently? Near March 15th, many unreasonable consumer traps in home building materials keep con ......
Equivalent to this standard adopts international standard ISO2248-1985 (completely packed, full-filled transport package vertical drop test) Falling test equipment (impact table): The impact table is a horizontal plane, which does not move or deform during the test and meets the following require ......
The heavy ion micropores are breathable and permeable to water. If applied with a colored liquid (such as a fountain pen), the pattern area will be colored, leaving a colorful pattern. In order to achieve anti-counterfeiting purposes. Heavy ion microporous anti-counterfeiting has its unique advan ......
The first domestic and the world's largest and largest high-power electric locomotive dynamic test rig has been inspected by Tianjin Electric Locomotive Co., Ltd. (Tianjin Locomotive Company), and has been officially put into use. This test rig was built by CNR Dalian Locomotive Research Insti ......
table of Contents 1. Company profile ................................................ .................................................. ............ 2 Second, the function and technical support of Liren e-bags ............................................. .................................... 2 ......
Constant temperature and humidity chamber, also known as constant temperature and humidity test chamber, is a sophisticated high-end instrument. There are thousands of internal and small parts, and sometimes the cause of a certain part makes the whole machine unable to start. With this set of faul ......
The drop test machine is mainly used to test the product packaging and some products are damaged by the fall, and to evaluate its impact strength during transportation and handling. It adopts double-column guide, the number of times of height drop can be set, the work is stable and reliable, and a ......
The natural soft resin varnish is applied to the surface of the completed and dried work, which will form a shiny and tough transparent film, which can not only prevent dust pollution and moisture erosion, but also protect the coloring layer to maintain the permanent beauty of the picture. . â†......