12.In general, China National Accreditation Service for Comformity Assesment (CNAS) is responsible for organizing proficiency testing activities in China?
17.In general,the cylindrical roller bearings, belonging to axial discerptible bearing,are suitable only for sustaining radial loads.The contact of roller with race is linear.
19.The Fanhua Spring is where people take therapeutic baths in richly carbonated water for skin diseases in general and psoriasis and scalp favus in particular.
20.Based on noncoherent DLL and arctan carrier PLL, the curves of tracking errors in general forms are given after a series of computing and simulation.