N, R and P. The N type is suitable for filtering non-oily particles, and the R and P types are suitable for filtering oily and non-oily particles. The service time limit of type P...

 In fact, GB19083-2010 "Technical Requirements for Medical Protective Masks" is the real source of the technical standards for protective masks in the medical industry. Reading thr...

1. Strict management of places (activities) 1. Shopping malls and supermarkets Agricultural markets, hotels, restaurants, transportation stations, scenic spots and other key places...

A: Sewage drainage trench is set in the unit area outside the workshop, which is beneficial to the collection of primary rainwater. Trenches should not be set in the workshop. Q: P...

 Its biggest characteristic is that after the reinforcement cage is placed in the drilling hole and the conduit is poured, the bottom of the hole can be kept less or no sediment, a...

Original title: Have you ever used these fishing methods of drill pipe and drill bit? In the process of pile foundation construction with rotary excavator big bore, the accidents o...

Second, the outside of the drill pipe, including the threaded portion and the main body of the drill pipe, must be wiped clean. At the same time, a rubber cover (as shown in the fi...

 According to the plan, Meiguan Expressway needs to carry out roadbed splicing, pavement asphalt overlay, bridge splicing and reinforcement or demolition and reconstruction, ramp a...

For the evaporation of general solution, η can be taken as 0.98-0.7 (where X is the composition change of the solution, expressed in mass fraction). Where: Di — heating steam quant...

Original Title: Popular Science: Structure and Working Principle of Rotary Evaporator Rotary evaporator, also known as rotary evaporator, is a common laboratory equipment composed...

The outstanding features of the antifreeze dust suppressant include: 1, that antifreeze dust suppressant organically combines dust suppression and antifreeze, so that the product h...

The basic requirement for the extraction equipment is that the two liquid phases of the extraction system can be fully mixed, closely contacted and accompanied by a high degree of...